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+[dependencies.bytemuck]
+version = "*"
+features = ["derive"]
+
+[dependencies.geo]
+version = "*"
+default-features = false
+
+[dependencies.glam]
+version = "*"
+features = ["bytemuck"]
diff --git a/experiments/2025-03-18/README.md b/experiments/2025-03-18/README.md
new file mode 100644
index 000000000..1fe7d0a44
--- /dev/null
+++ b/experiments/2025-03-18/README.md
@@ -0,0 +1,44 @@
+# Fornjot - Experiment 2025-03-18
+
+## About
+
+This experiment is packaged as a single application. Run it with `cargo run`.
+This should open a window and also create a 3MF file in this directory.
+
+## Context
+
+It has become clear, that Fornjot's current architecture is at a local maximum.
+I also think it is too complicated for what it does, and suspect that a simpler
+architecture would serve us much better going forward.
+
+While it's certainly not impossible to address this piecemeal, through
+incremental improvements (which is the approach that I usually prefer), I don't
+think this is the best course of action.
+
+Because while I don't consider the architecture to be very good, it is still
+consistent and self-reinforcing. Whenever I try to simplify one aspect, I run
+into the problem that it's there for a reason; that other aspects of the
+architecture depend on it being the way it is.
+
+And while I haven't figured out yet, how to break out of this situation, I do
+have quite a few unproven ideas on how an improved architecture would look like,
+redesigned from the ground up using the experience I've gained over the last few
+years.
+
+This experiment is the third in a series meant to prove out those ideas. The
+results should provide a clearer picture of what is possible, and how the
+current architecture can be evolved.
+
+## Setup
+
+This experiment builds on [the second one](../2024-12-09/). There are two
+objectives:
+
+- Simplify the `Object` trait by removing as much functionality as possible.
+  Compensate for the loss of insight into an object's structure by experimenting
+  with other means of providing required debug information.
+- Expand the existing b-rep primitives, adding support for curved surfaces.
+
+## Result
+
+The experiment is still ongoing.
diff --git a/experiments/2025-03-18/shell.nix b/experiments/2025-03-18/shell.nix
new file mode 100644
index 000000000..2fb5abdf2
--- /dev/null
+++ b/experiments/2025-03-18/shell.nix
@@ -0,0 +1,12 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  libPath = with pkgs; lib.makeLibraryPath [
+    libxkbcommon
+    vulkan-loader
+    wayland
+  ];
+in
+pkgs.mkShell {
+  LD_LIBRARY_PATH = "${libPath}";
+}
diff --git a/experiments/2025-03-18/src/app.rs b/experiments/2025-03-18/src/app.rs
new file mode 100644
index 000000000..918d70fa8
--- /dev/null
+++ b/experiments/2025-03-18/src/app.rs
@@ -0,0 +1,134 @@
+use std::{collections::BTreeSet, sync::Arc};
+
+use winit::{
+    application::ApplicationHandler,
+    event::{ElementState, KeyEvent, WindowEvent},
+    event_loop::{ActiveEventLoop, EventLoop},
+    keyboard::{Key, NamedKey},
+    window::{Window, WindowAttributes, WindowId},
+};
+
+use crate::{object::HandleAny, render::Renderer, view::OperationView};
+
+pub fn run(shape: HandleAny) -> anyhow::Result<()> {
+    let view = OperationView::new(shape);
+
+    let event_loop = EventLoop::new()?;
+
+    let mut app = App {
+        view,
+        window: None,
+        renderer: None,
+        pressed_keys: BTreeSet::new(),
+    };
+    event_loop.run_app(&mut app)?;
+
+    Ok(())
+}
+
+struct App {
+    view: OperationView,
+    window: Option<Arc<Window>>,
+    renderer: Option<Renderer>,
+    pressed_keys: BTreeSet<Key>,
+}
+
+impl ApplicationHandler for App {
+    fn resumed(&mut self, event_loop: &ActiveEventLoop) {
+        let (window, renderer) = match init(event_loop) {
+            Ok(ok) => ok,
+            Err(err) => {
+                eprintln!("Initialization error: `{err:?}`");
+                event_loop.exit();
+                return;
+            }
+        };
+
+        self.window = Some(window);
+        self.renderer = Some(renderer);
+    }
+
+    fn window_event(
+        &mut self,
+        event_loop: &ActiveEventLoop,
+        _: WindowId,
+        event: WindowEvent,
+    ) {
+        let (Some(window), Some(renderer)) =
+            (self.window.as_ref(), self.renderer.as_mut())
+        else {
+            return;
+        };
+
+        match event {
+            WindowEvent::CloseRequested => {
+                event_loop.exit();
+            }
+            WindowEvent::KeyboardInput {
+                event:
+                    KeyEvent {
+                        logical_key: Key::Named(NamedKey::Escape),
+                        ..
+                    },
+                ..
+            } => {
+                event_loop.exit();
+            }
+            WindowEvent::KeyboardInput {
+                event:
+                    KeyEvent {
+                        logical_key, state, ..
+                    },
+                ..
+            } => {
+                match state {
+                    ElementState::Pressed => {
+                        if self.pressed_keys.contains(&logical_key) {
+                            return;
+                        }
+                    }
+                    ElementState::Released => {
+                        self.pressed_keys.remove(&logical_key);
+                        return;
+                    }
+                }
+
+                match logical_key {
+                    Key::Named(NamedKey::ArrowRight) => {
+                        self.view.selected_mut().select_last();
+                    }
+                    Key::Named(NamedKey::ArrowLeft) => {
+                        self.view.parent_of_selected_mut().select_none();
+                    }
+                    Key::Named(NamedKey::ArrowDown) => {
+                        self.view.parent_of_selected_mut().select_next();
+                    }
+                    Key::Named(NamedKey::ArrowUp) => {
+                        self.view.parent_of_selected_mut().select_previous();
+                    }
+                    _ => {}
+                }
+
+                window.request_redraw();
+            }
+            WindowEvent::RedrawRequested => {
+                if let Err(err) = renderer.render(&self.view) {
+                    eprintln!("Render error: {err}");
+                }
+            }
+            _ => {}
+        }
+    }
+}
+
+fn init(
+    event_loop: &ActiveEventLoop,
+) -> anyhow::Result<(Arc<Window>, Renderer)> {
+    let window = {
+        let window = event_loop.create_window(WindowAttributes::default())?;
+        Arc::new(window)
+    };
+    let renderer = pollster::block_on(Renderer::new(window.clone()))?;
+
+    Ok((window, renderer))
+}
diff --git a/experiments/2025-03-18/src/export.rs b/experiments/2025-03-18/src/export.rs
new file mode 100644
index 000000000..04fa23aa2
--- /dev/null
+++ b/experiments/2025-03-18/src/export.rs
@@ -0,0 +1,45 @@
+use std::{collections::BTreeMap, fs::File};
+
+use crate::object::Object;
+
+pub fn export(op: &dyn Object) -> anyhow::Result<()> {
+    let tri_mesh = op.tri_mesh();
+
+    let mut indices_by_vertex = BTreeMap::new();
+
+    let mut points = Vec::new();
+    let mut triangles = Vec::new();
+
+    for triangle in tri_mesh.external_triangles() {
+        let triangle = triangle.points.map(|point| {
+            *indices_by_vertex.entry(point).or_insert_with(|| {
+                let index = points.len();
+                points.push(point);
+                index
+            })
+        });
+
+        triangles.push(triangle);
+    }
+
+    let mesh = threemf::Mesh {
+        vertices: threemf::model::Vertices {
+            vertex: points
+                .into_iter()
+                .map(|point| point.coords.components.map(|coord| coord.value()))
+                .map(|[x, y, z]| threemf::model::Vertex { x, y, z })
+                .collect(),
+        },
+        triangles: threemf::model::Triangles {
+            triangle: triangles
+                .into_iter()
+                .map(|[v1, v2, v3]| threemf::model::Triangle { v1, v2, v3 })
+                .collect(),
+        },
+    };
+
+    let output = File::create("output.3mf")?;
+    threemf::write(output, mesh)?;
+
+    Ok(())
+}
diff --git a/experiments/2025-03-18/src/extra/mod.rs b/experiments/2025-03-18/src/extra/mod.rs
new file mode 100644
index 000000000..27a91256e
--- /dev/null
+++ b/experiments/2025-03-18/src/extra/mod.rs
@@ -0,0 +1 @@
+pub mod triangulate;
diff --git a/experiments/2025-03-18/src/extra/triangulate.rs b/experiments/2025-03-18/src/extra/triangulate.rs
new file mode 100644
index 000000000..1484a9c58
--- /dev/null
+++ b/experiments/2025-03-18/src/extra/triangulate.rs
@@ -0,0 +1,146 @@
+use std::{
+    collections::{BTreeSet, VecDeque},
+    mem,
+};
+
+use geo::{Contains, Coord, LineString, Polygon};
+use spade::Triangulation;
+
+use crate::{
+    geometry::{MeshTriangle, TriMesh, Triangle},
+    math::Point,
+    topology::face::Face,
+};
+
+pub fn triangulate(face: &Face) -> TriMesh {
+    let points = points(face);
+    let triangles = triangles(&points);
+
+    let polygon = polygon(&points);
+    let triangles_in_face = triangles
+        .into_iter()
+        .filter(|triangle| {
+            let points = triangle.map(|point| point.point_surface);
+            let triangle = Triangle { points };
+
+            let [x, y] = triangle.center().coords.components.map(|s| s.value());
+            polygon.contains(&Coord { x, y })
+        })
+        .map(|triangle| {
+            let points = triangle.map(|point| point.point_vertex);
+            MeshTriangle {
+                inner: Triangle { points },
+                is_internal: face.is_internal,
+            }
+        });
+
+    let mut mesh = TriMesh::new();
+    mesh.triangles.extend(triangles_in_face);
+
+    mesh
+}
+
+fn points(face: &Face) -> Vec<TriangulationPoint> {
+    face.half_edges
+        .iter()
+        .map(|half_edge| {
+            // Here, we project a 3D point (from the vertex) into the face's
+            // surface, creating a 2D point. Through the surface, this 2D
+            // point has a position in 3D space.
+            //
+            // But this position isn't necessarily going to be the same as
+            // the position of the original 3D point, due to numerical
+            // inaccuracy.
+            //
+            // This doesn't matter. Neither does the fact, that other faces
+            // might share the same vertices and project them into their own
+            // surfaces, creating more redundancy.
+            //
+            // The reason that it doesn't, is that we're using the projected
+            // 2D points _only_ for this local triangulation. Once that
+            // tells us how the different 3D points must connect, we use the
+            // original 3D points to build those triangles. We never convert
+            // the 2D points back into 3D.
+            let point_surface =
+                face.surface.geometry.project_point(half_edge.start.point);
+
+            TriangulationPoint {
+                point_surface,
+                point_vertex: half_edge.start.point,
+            }
+        })
+        .collect()
+}
+
+fn triangles(points: &[TriangulationPoint]) -> Vec<[TriangulationPoint; 3]> {
+    let mut triangulation = spade::ConstrainedDelaunayTriangulation::<_>::new();
+
+    // We're passing duplicate points to the triangulation here. It doesn't seem
+    // to mind though.
+    triangulation
+        .add_constraint_edges(points.iter().copied(), true)
+        .unwrap();
+
+    triangulation
+        .inner_faces()
+        .map(|triangle| triangle.vertices().map(|vertex| *vertex.data()))
+        .collect()
+}
+
+fn polygon(points: &[TriangulationPoint]) -> Polygon {
+    // This is a placeholder implementation that is probably not well-tested and
+    // probably doesn't support polygons with multiple holes.
+
+    let mut line_strings = VecDeque::new();
+    let mut current_line_string = Vec::new();
+    let mut visited_points = BTreeSet::new();
+
+    for point in points {
+        if visited_points.contains(point) {
+            line_strings.push_back(mem::take(&mut current_line_string));
+            continue;
+        }
+
+        let [x, y] = point.point_surface.coords.components.map(|s| s.value());
+        current_line_string.push(Coord { x, y });
+        visited_points.insert(point);
+    }
+
+    let (exterior, interiors) = if let Some(exterior) = line_strings.pop_front()
+    {
+        line_strings.push_back(mem::take(&mut current_line_string));
+
+        let exterior = LineString::new(exterior);
+        let interiors = line_strings
+            .into_iter()
+            .filter_map(|line_string| {
+                (!line_string.is_empty())
+                    .then_some(LineString::new(line_string))
+            })
+            .collect();
+
+        (exterior, interiors)
+    } else {
+        let exterior = LineString::new(current_line_string);
+        let interiors = Vec::new();
+
+        (exterior, interiors)
+    };
+
+    Polygon::new(exterior, interiors)
+}
+
+#[derive(Clone, Copy, Eq, Ord, PartialEq, PartialOrd)]
+struct TriangulationPoint {
+    point_surface: Point<2>,
+    point_vertex: Point<3>,
+}
+
+impl spade::HasPosition for TriangulationPoint {
+    type Scalar = f64;
+
+    fn position(&self) -> spade::Point2<Self::Scalar> {
+        let [x, y] = self.point_surface.coords.components.map(|s| s.value());
+        spade::Point2 { x, y }
+    }
+}
diff --git a/experiments/2025-03-18/src/geometry/mod.rs b/experiments/2025-03-18/src/geometry/mod.rs
new file mode 100644
index 000000000..16c612bd3
--- /dev/null
+++ b/experiments/2025-03-18/src/geometry/mod.rs
@@ -0,0 +1,11 @@
+mod sketch;
+mod surface;
+mod tri_mesh;
+mod triangle;
+
+pub use self::{
+    sketch::Sketch,
+    surface::SurfaceGeometry,
+    tri_mesh::{MeshTriangle, TriMesh},
+    triangle::Triangle,
+};
diff --git a/experiments/2025-03-18/src/geometry/sketch.rs b/experiments/2025-03-18/src/geometry/sketch.rs
new file mode 100644
index 000000000..3b6626e14
--- /dev/null
+++ b/experiments/2025-03-18/src/geometry/sketch.rs
@@ -0,0 +1,66 @@
+use std::collections::{BTreeMap, BTreeSet};
+
+use itertools::Itertools;
+
+use crate::{
+    math::Point,
+    object::Handle,
+    topology::{
+        face::Face, half_edge::HalfEdge, surface::Surface, vertex::Vertex,
+    },
+};
+
+pub struct Sketch {
+    pub points: Vec<Point<2>>,
+}
+
+impl Sketch {
+    pub fn to_face(&self, surface: Handle<Surface>) -> Face {
+        let mut vertices_by_local_point: BTreeMap<_, Vec<_>> = BTreeMap::new();
+        let vertices = self
+            .points
+            .iter()
+            .copied()
+            .map(|point| {
+                let point = surface.geometry.point_from_local(point);
+                let vertex = Handle::new(Vertex::new(point));
+
+                vertices_by_local_point
+                    .entry(point)
+                    .or_default()
+                    .push(vertex.clone());
+
+                vertex
+            })
+            .collect::<Vec<_>>();
+
+        let mut coincident_vertices = BTreeSet::new();
+        for vertices in vertices_by_local_point.into_values() {
+            if vertices.len() > 1 {
+                coincident_vertices.extend(vertices);
+            }
+        }
+
+        let half_edges = vertices.into_iter().circular_tuple_windows().map(
+            |(start, end)| {
+                let is_internal = coincident_vertices.contains(&start)
+                    && coincident_vertices.contains(&end);
+
+                Handle::new(HalfEdge { start, is_internal })
+            },
+        );
+
+        Face::new(surface, half_edges, false)
+    }
+}
+
+impl<I, P> From<I> for Sketch
+where
+    I: IntoIterator<Item = P>,
+    P: Into<Point<2>>,
+{
+    fn from(points: I) -> Self {
+        let points = points.into_iter().map(Into::into).collect();
+        Self { points }
+    }
+}
diff --git a/experiments/2025-03-18/src/geometry/surface.rs b/experiments/2025-03-18/src/geometry/surface.rs
new file mode 100644
index 000000000..bc31ec04a
--- /dev/null
+++ b/experiments/2025-03-18/src/geometry/surface.rs
@@ -0,0 +1,26 @@
+use crate::math::{Plane, Point, Vector};
+
+pub trait SurfaceGeometry {
+    fn point_from_local(&self, point: Point<2>) -> Point<3>;
+    fn project_point(&self, point: Point<3>) -> Point<2>;
+    fn flip(&self) -> Box<dyn SurfaceGeometry>;
+    fn translate(&self, offset: Vector<3>) -> Box<dyn SurfaceGeometry>;
+}
+
+impl SurfaceGeometry for Plane {
+    fn point_from_local(&self, point: Point<2>) -> Point<3> {
+        self.point_from_local(point)
+    }
+
+    fn project_point(&self, point: Point<3>) -> Point<2> {
+        self.project_point(point)
+    }
+
+    fn flip(&self) -> Box<dyn SurfaceGeometry> {
+        Box::new((*self).flip())
+    }
+
+    fn translate(&self, offset: Vector<3>) -> Box<dyn SurfaceGeometry> {
+        Box::new((*self).translate(offset))
+    }
+}
diff --git a/experiments/2025-03-18/src/geometry/tri_mesh.rs b/experiments/2025-03-18/src/geometry/tri_mesh.rs
new file mode 100644
index 000000000..6932dc0c9
--- /dev/null
+++ b/experiments/2025-03-18/src/geometry/tri_mesh.rs
@@ -0,0 +1,35 @@
+use super::Triangle;
+
+#[derive(Debug)]
+pub struct TriMesh {
+    pub triangles: Vec<MeshTriangle>,
+}
+
+impl TriMesh {
+    pub fn new() -> Self {
+        Self {
+            triangles: Vec::new(),
+        }
+    }
+
+    pub fn merge(mut self, other: Self) -> Self {
+        self.triangles.extend(other.triangles);
+        self
+    }
+
+    pub fn all_triangles(&self) -> impl Iterator<Item = Triangle<3>> {
+        self.triangles.iter().map(|triangle| triangle.inner)
+    }
+
+    pub fn external_triangles(&self) -> impl Iterator<Item = Triangle<3>> {
+        self.triangles.iter().filter_map(|triangle| {
+            (!triangle.is_internal).then_some(triangle.inner)
+        })
+    }
+}
+
+#[derive(Debug)]
+pub struct MeshTriangle {
+    pub inner: Triangle<3>,
+    pub is_internal: bool,
+}
diff --git a/experiments/2025-03-18/src/geometry/triangle.rs b/experiments/2025-03-18/src/geometry/triangle.rs
new file mode 100644
index 000000000..81432d79b
--- /dev/null
+++ b/experiments/2025-03-18/src/geometry/triangle.rs
@@ -0,0 +1,51 @@
+use std::fmt;
+
+use crate::{
+    math::Point,
+    object::{HandleAny, Object},
+};
+
+use super::{MeshTriangle, TriMesh};
+
+#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct Triangle<const D: usize> {
+    pub points: [Point<D>; 3],
+}
+
+impl<const D: usize> Triangle<D> {
+    pub fn center(&self) -> Point<D> {
+        let [a, b, c] = self.points;
+        let coords = (a.coords + b.coords + c.coords) / 3.;
+        Point { coords }
+    }
+}
+
+impl<P, const D: usize> From<[P; 3]> for Triangle<D>
+where
+    P: Into<Point<D>>,
+{
+    fn from(points: [P; 3]) -> Self {
+        Self {
+            points: points.map(Into::into),
+        }
+    }
+}
+
+impl Object for Triangle<3> {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Triangle")
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        TriMesh {
+            triangles: vec![MeshTriangle {
+                inner: *self,
+                is_internal: false,
+            }],
+        }
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        Vec::new()
+    }
+}
diff --git a/experiments/2025-03-18/src/main.rs b/experiments/2025-03-18/src/main.rs
new file mode 100644
index 000000000..af5d0d531
--- /dev/null
+++ b/experiments/2025-03-18/src/main.rs
@@ -0,0 +1,22 @@
+#![allow(clippy::module_inception)]
+
+mod app;
+mod export;
+mod extra;
+mod geometry;
+mod math;
+mod model;
+mod object;
+mod operations;
+mod render;
+mod topology;
+mod view;
+
+fn main() -> anyhow::Result<()> {
+    let model = model::model();
+
+    export::export(&model)?;
+    app::run(model)?;
+
+    Ok(())
+}
diff --git a/experiments/2025-03-18/src/math/bivector.rs b/experiments/2025-03-18/src/math/bivector.rs
new file mode 100644
index 000000000..9ed8b6978
--- /dev/null
+++ b/experiments/2025-03-18/src/math/bivector.rs
@@ -0,0 +1,7 @@
+use super::Vector;
+
+#[derive(Clone, Copy, Debug)]
+pub struct Bivector<const D: usize> {
+    pub a: Vector<D>,
+    pub b: Vector<D>,
+}
diff --git a/experiments/2025-03-18/src/math/mod.rs b/experiments/2025-03-18/src/math/mod.rs
new file mode 100644
index 000000000..8864ae2c8
--- /dev/null
+++ b/experiments/2025-03-18/src/math/mod.rs
@@ -0,0 +1,10 @@
+mod bivector;
+mod plane;
+mod point;
+mod scalar;
+mod vector;
+
+pub use self::{
+    bivector::Bivector, plane::Plane, point::Point, scalar::Scalar,
+    vector::Vector,
+};
diff --git a/experiments/2025-03-18/src/math/plane.rs b/experiments/2025-03-18/src/math/plane.rs
new file mode 100644
index 000000000..13582c3d6
--- /dev/null
+++ b/experiments/2025-03-18/src/math/plane.rs
@@ -0,0 +1,80 @@
+use super::{Bivector, Point, Vector};
+
+#[derive(Clone, Copy, Debug)]
+pub struct Plane {
+    pub origin: Point<3>,
+    pub coords: Bivector<3>,
+}
+
+impl Plane {
+    pub fn from_points([a, b, c]: [Point<3>; 3]) -> Self {
+        Self {
+            origin: a,
+            coords: Bivector { a: b - a, b: c - a },
+        }
+    }
+
+    pub fn u(&self) -> Vector<3> {
+        self.coords.a
+    }
+
+    pub fn v(&self) -> Vector<3> {
+        self.coords.b
+    }
+
+    pub fn normal(&self) -> Vector<3> {
+        self.u().cross(self.v()).normalize()
+    }
+
+    pub fn point_from_local(&self, point: impl Into<Point<2>>) -> Point<3> {
+        let [u, v] = point.into().coords.components;
+        self.origin + self.coords.a * u + self.coords.b * v
+    }
+
+    pub fn project_point(&self, point: impl Into<Point<3>>) -> Point<2> {
+        let point = point.into();
+        let origin_to_point = point - self.origin;
+
+        let min_distance_plane_to_point = origin_to_point.dot(&self.normal());
+        let point_in_plane =
+            point - self.normal() * min_distance_plane_to_point;
+        let origin_to_point_in_plane = point_in_plane - self.origin;
+
+        let u = origin_to_point_in_plane.dot(&self.u());
+        let v = origin_to_point_in_plane.dot(&self.v());
+
+        Point::from([u, v])
+    }
+
+    pub fn flip(mut self) -> Self {
+        self.coords.b = -self.coords.b;
+        self
+    }
+
+    pub fn translate(self, offset: impl Into<Vector<3>>) -> Self {
+        Self {
+            origin: self.origin + offset,
+            coords: self.coords,
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::math::{Bivector, Point, Vector};
+
+    use super::Plane;
+
+    #[test]
+    fn project_point() {
+        let plane = Plane {
+            origin: Point::from([1., 1., 1.]),
+            coords: Bivector {
+                a: Vector::from([1., 0., 0.]),
+                b: Vector::from([0., 1., 0.]),
+            },
+        };
+
+        assert_eq!(plane.project_point([2., 2., 2.]), Point::from([1., 1.]));
+    }
+}
diff --git a/experiments/2025-03-18/src/math/point.rs b/experiments/2025-03-18/src/math/point.rs
new file mode 100644
index 000000000..37dd2f655
--- /dev/null
+++ b/experiments/2025-03-18/src/math/point.rs
@@ -0,0 +1,49 @@
+use std::ops;
+
+use super::Vector;
+
+#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct Point<const D: usize> {
+    pub coords: Vector<D>,
+}
+
+impl<V, const D: usize> From<V> for Point<D>
+where
+    V: Into<Vector<D>>,
+{
+    fn from(coords: V) -> Self {
+        Self {
+            coords: coords.into(),
+        }
+    }
+}
+
+impl<V, const D: usize> ops::Add<V> for Point<D>
+where
+    V: Into<Vector<D>>,
+{
+    type Output = Self;
+
+    fn add(self, other: V) -> Self::Output {
+        let other = other.into();
+        let coords = self.coords + other;
+        Self { coords }
+    }
+}
+
+impl<const D: usize> ops::Sub<Point<D>> for Point<D> {
+    type Output = Vector<D>;
+
+    fn sub(self, other: Point<D>) -> Self::Output {
+        self.coords - other.coords
+    }
+}
+
+impl<const D: usize> ops::Sub<Vector<D>> for Point<D> {
+    type Output = Point<D>;
+
+    fn sub(self, other: Vector<D>) -> Self::Output {
+        let coords = self.coords - other;
+        Self { coords }
+    }
+}
diff --git a/experiments/2025-03-18/src/math/scalar.rs b/experiments/2025-03-18/src/math/scalar.rs
new file mode 100644
index 000000000..45ee52fb0
--- /dev/null
+++ b/experiments/2025-03-18/src/math/scalar.rs
@@ -0,0 +1,116 @@
+use std::{cmp::Ordering, ops};
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Scalar {
+    value: f64,
+}
+
+impl Scalar {
+    pub fn new(value: f64) -> Self {
+        if value.is_nan() {
+            panic!("`Scalar` value must not be NaN");
+        }
+        if value.is_infinite() {
+            panic!("`Scalar` value must not be infinite. Value: `{value}`");
+        }
+
+        Self { value }
+    }
+
+    pub fn zero() -> Self {
+        Self::new(0.)
+    }
+
+    pub fn value(&self) -> f64 {
+        self.value
+    }
+
+    pub fn sqrt(self) -> Self {
+        let value = self.value().sqrt();
+        Self::new(value)
+    }
+}
+
+impl Eq for Scalar {}
+
+impl Ord for Scalar {
+    fn cmp(&self, other: &Self) -> Ordering {
+        let Some(ordering) = self.value.partial_cmp(&other.value) else {
+            unreachable!(
+                "Failed to compare `Scalar` values `{}` and `{}`",
+                self.value, other.value
+            );
+        };
+
+        ordering
+    }
+}
+
+impl PartialOrd for Scalar {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl From<f64> for Scalar {
+    fn from(value: f64) -> Self {
+        Self::new(value)
+    }
+}
+
+impl<S> ops::Add<S> for Scalar
+where
+    S: Into<Scalar>,
+{
+    type Output = Self;
+
+    fn add(self, other: S) -> Self::Output {
+        let value = self.value() + other.into().value();
+        Self::new(value)
+    }
+}
+
+impl<S> ops::Div<S> for Scalar
+where
+    S: Into<Scalar>,
+{
+    type Output = Self;
+
+    fn div(self, other: S) -> Self::Output {
+        let value = self.value() / other.into().value();
+        Self::new(value)
+    }
+}
+
+impl<S> ops::Mul<S> for Scalar
+where
+    S: Into<Scalar>,
+{
+    type Output = Self;
+
+    fn mul(self, other: S) -> Self::Output {
+        let value = self.value() * other.into().value();
+        Self::new(value)
+    }
+}
+
+impl ops::Neg for Scalar {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        let value = -self.value();
+        Self::new(value)
+    }
+}
+
+impl<S> ops::Sub<S> for Scalar
+where
+    S: Into<Scalar>,
+{
+    type Output = Self;
+
+    fn sub(self, other: S) -> Self::Output {
+        let value = self.value() - other.into().value();
+        Self::new(value)
+    }
+}
diff --git a/experiments/2025-03-18/src/math/vector.rs b/experiments/2025-03-18/src/math/vector.rs
new file mode 100644
index 000000000..343cfe164
--- /dev/null
+++ b/experiments/2025-03-18/src/math/vector.rs
@@ -0,0 +1,135 @@
+use std::ops;
+
+use iter_fixed::IntoIteratorFixed;
+
+use super::Scalar;
+
+#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct Vector<const D: usize> {
+    pub components: [Scalar; D],
+}
+
+impl<const D: usize> Vector<D> {
+    pub fn magnitude(&self) -> Scalar {
+        self.dot(self).sqrt()
+    }
+
+    pub fn normalize(self) -> Self {
+        self / self.magnitude()
+    }
+
+    pub fn dot(&self, other: &Self) -> Scalar {
+        self.components
+            .into_iter()
+            .zip(other.components)
+            .map(|(a, b)| a * b)
+            .reduce(|a, b| a + b)
+            .unwrap_or(Scalar::zero())
+    }
+}
+
+impl Vector<3> {
+    pub fn cross(self, other: Self) -> Self {
+        let [ax, ay, az] = self.components;
+        let [bx, by, bz] = other.components;
+
+        Self {
+            components: [
+                ay * bz - az * by,
+                az * bx - ax * bz,
+                ax * by - ay * bx,
+            ],
+        }
+    }
+}
+
+impl<S, const D: usize> From<[S; D]> for Vector<D>
+where
+    S: Into<Scalar>,
+{
+    fn from(components: [S; D]) -> Self {
+        Self {
+            components: components.map(Into::into),
+        }
+    }
+}
+
+impl<V, const D: usize> ops::Add<V> for Vector<D>
+where
+    V: Into<Vector<D>>,
+{
+    type Output = Self;
+
+    fn add(self, other: V) -> Self::Output {
+        let other = other.into();
+
+        let components = self
+            .components
+            .into_iter_fixed()
+            .zip(other.components)
+            .map(|(a, b)| a + b)
+            .collect();
+
+        Self { components }
+    }
+}
+
+impl<S, const D: usize> ops::Div<S> for Vector<D>
+where
+    S: Into<Scalar>,
+{
+    type Output = Self;
+
+    fn div(self, scalar: S) -> Self::Output {
+        let scalar = scalar.into();
+        let components = self.components.map(|component| component / scalar);
+        Self { components }
+    }
+}
+
+impl<S, const D: usize> ops::Mul<S> for Vector<D>
+where
+    S: Into<Scalar>,
+{
+    type Output = Self;
+
+    fn mul(self, scalar: S) -> Self::Output {
+        let scalar = scalar.into();
+
+        let components = self
+            .components
+            .into_iter_fixed()
+            .map(|v| v * scalar)
+            .collect();
+
+        Self { components }
+    }
+}
+
+impl<const D: usize> ops::Neg for Vector<D> {
+    type Output = Self;
+
+    fn neg(self) -> Self::Output {
+        self * -1.
+    }
+}
+
+impl<V, const D: usize> ops::Sub<V> for Vector<D>
+where
+    V: Into<Vector<D>>,
+{
+    type Output = Self;
+
+    fn sub(self, other: V) -> Self::Output {
+        let other = other.into();
+
+        let components = self
+            .components
+            .into_iter_fixed()
+            .zip(other.components)
+            .map(|(a, b)| a - b)
+            .collect();
+
+        Self { components }
+    }
+}
diff --git a/experiments/2025-03-18/src/model.rs b/experiments/2025-03-18/src/model.rs
new file mode 100644
index 000000000..1407d31f6
--- /dev/null
+++ b/experiments/2025-03-18/src/model.rs
@@ -0,0 +1,46 @@
+use crate::{
+    geometry::Sketch,
+    math::{Bivector, Plane, Point, Vector},
+    object::{Handle, HandleAny},
+    operations::sweep::SweepExt,
+    topology::surface::Surface,
+};
+
+pub fn model() -> HandleAny {
+    let top = {
+        let sketch = Sketch::from([
+            // outer boundary
+            [-1., -1.],
+            [1., -1.],
+            [1., 1.],
+            [-1., 1.],
+            // connection to inner boundary
+            [-1., -1.],
+            // inner boundary
+            [-0.5, -0.5],
+            [-0.5, 0.5],
+            [0.5, 0.5],
+            [0.5, -0.5],
+            // connection to outer boundary
+            [-0.5, -0.5],
+            // half-edge between last and first vertex is implicit, so we're done here
+        ]);
+
+        let surface = Handle::new(Surface {
+            geometry: Box::new(Plane {
+                origin: Point::from([0., 0., 1.]),
+                coords: Bivector {
+                    a: Vector::from([1., 0., 0.]),
+                    b: Vector::from([0., 1., 0.]),
+                },
+            }),
+        });
+
+        let face = sketch.to_face(surface);
+        Handle::new(face)
+    };
+
+    let solid = top.sweep([0., 0., -2.]);
+
+    HandleAny::new(solid)
+}
diff --git a/experiments/2025-03-18/src/object/handle.rs b/experiments/2025-03-18/src/object/handle.rs
new file mode 100644
index 000000000..d0375f13b
--- /dev/null
+++ b/experiments/2025-03-18/src/object/handle.rs
@@ -0,0 +1,74 @@
+use std::{cmp::Ordering, fmt, ops::Deref, rc::Rc};
+
+use super::{HandleAny, Object};
+
+pub struct Handle<T> {
+    inner: Rc<T>,
+}
+
+impl<T> Handle<T> {
+    pub fn new(inner: T) -> Self {
+        Self {
+            inner: Rc::new(inner),
+        }
+    }
+}
+
+impl<T> Handle<T>
+where
+    T: Object + 'static,
+{
+    pub fn to_any(&self) -> HandleAny {
+        self.clone().into_any()
+    }
+
+    pub fn into_any(self) -> HandleAny {
+        HandleAny { inner: self.inner }
+    }
+}
+
+impl<T> Clone for Handle<T> {
+    fn clone(&self) -> Self {
+        Self {
+            inner: self.inner.clone(),
+        }
+    }
+}
+
+impl<T> Deref for Handle<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}
+
+impl<T> Eq for Handle<T> {}
+
+impl<T> Ord for Handle<T> {
+    fn cmp(&self, other: &Self) -> Ordering {
+        Rc::as_ptr(&self.inner)
+            .cast::<()>()
+            .cmp(&Rc::as_ptr(&other.inner).cast::<()>())
+    }
+}
+
+impl<T> PartialEq for Handle<T> {
+    fn eq(&self, other: &Self) -> bool {
+        Rc::ptr_eq(&self.inner, &other.inner)
+    }
+}
+
+impl<T> PartialOrd for Handle<T> {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl<T> fmt::Debug for Handle<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("Handle")
+            .field("inner", &Rc::as_ptr(&self.inner))
+            .finish()
+    }
+}
diff --git a/experiments/2025-03-18/src/object/handle_any.rs b/experiments/2025-03-18/src/object/handle_any.rs
new file mode 100644
index 000000000..25cdebbdc
--- /dev/null
+++ b/experiments/2025-03-18/src/object/handle_any.rs
@@ -0,0 +1,33 @@
+use std::{fmt, rc::Rc};
+
+use crate::geometry::TriMesh;
+
+use super::Object;
+
+#[derive(Clone)]
+pub struct HandleAny {
+    pub(super) inner: Rc<dyn Object>,
+}
+
+impl HandleAny {
+    pub fn new(op: impl Object + 'static) -> Self {
+        Self { inner: Rc::new(op) }
+    }
+}
+
+impl Object for HandleAny {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.inner.display(f)?;
+        write!(f, " ({:?})", Rc::as_ptr(&self.inner))?;
+
+        Ok(())
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        self.inner.tri_mesh()
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        self.inner.children()
+    }
+}
diff --git a/experiments/2025-03-18/src/object/mod.rs b/experiments/2025-03-18/src/object/mod.rs
new file mode 100644
index 000000000..d696f968e
--- /dev/null
+++ b/experiments/2025-03-18/src/object/mod.rs
@@ -0,0 +1,5 @@
+mod handle;
+mod handle_any;
+mod traits;
+
+pub use self::{handle::Handle, handle_any::HandleAny, traits::Object};
diff --git a/experiments/2025-03-18/src/object/traits.rs b/experiments/2025-03-18/src/object/traits.rs
new file mode 100644
index 000000000..160001e1c
--- /dev/null
+++ b/experiments/2025-03-18/src/object/traits.rs
@@ -0,0 +1,28 @@
+use std::fmt;
+
+use crate::geometry::TriMesh;
+
+use super::HandleAny;
+
+pub trait Object {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result;
+    fn tri_mesh(&self) -> TriMesh;
+    fn children(&self) -> Vec<HandleAny>;
+
+    fn label(&self) -> OperationDisplay
+    where
+        Self: Sized,
+    {
+        OperationDisplay { op: self as &_ }
+    }
+}
+
+pub struct OperationDisplay<'r> {
+    pub op: &'r dyn Object,
+}
+
+impl fmt::Display for OperationDisplay<'_> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.op.display(f)
+    }
+}
diff --git a/experiments/2025-03-18/src/operations/connect.rs b/experiments/2025-03-18/src/operations/connect.rs
new file mode 100644
index 000000000..24d2ac365
--- /dev/null
+++ b/experiments/2025-03-18/src/operations/connect.rs
@@ -0,0 +1,76 @@
+use crate::{
+    math::Plane,
+    object::Handle,
+    topology::{
+        face::Face, half_edge::HalfEdge, solid::Solid, surface::Surface,
+    },
+};
+
+pub trait ConnectExt {
+    /// # Connect two faces by creating a side wall of faces from their vertices
+    ///
+    /// ## Panics
+    ///
+    /// Panics, if the two faces provided do not have the same number of
+    /// half-edges.
+    ///
+    /// Panics, if an internal half-edge of one face would connect to an
+    /// external half-edge of the other.
+    ///
+    /// ## Implementation Note
+    ///
+    /// This method has very particular (and undocumented) requirements about
+    /// the orientation of the two faces relative to each other, and will
+    /// happily generate invalid geometry, if those undocumented requirements
+    /// aren't met.
+    ///
+    /// It should be seen as more of a placeholder for a real implementation of
+    /// this operation.
+    fn connect(self, other: Self) -> Solid;
+}
+
+impl ConnectExt for Handle<Face> {
+    fn connect(self, other: Self) -> Solid {
+        assert_eq!(
+            self.half_edges.len(),
+            other.half_edges.len(),
+            "Can only connect faces that have the same number of vertices.",
+        );
+
+        let side_faces = self
+            .half_edges_with_end_vertex()
+            .zip(other.half_edges_with_end_vertex())
+            .map(|((q, r), (t, s))| {
+                let is_internal = match [q.is_internal, t.is_internal] {
+                    [true, true] => true,
+                    [false, false] => false,
+                    _ => {
+                        panic!(
+                            "Trying to connect an internal half-edge of one \
+                            face to an external half-edge of another"
+                        );
+                    }
+                };
+
+                let surface = Handle::new(Surface {
+                    geometry: Box::new(Plane::from_points(
+                        [&q.start, r, s].map(|vertex| vertex.point),
+                    )),
+                });
+                let face = Face::new(
+                    surface,
+                    [&q.start, r, s, &t.start].map(|vertex| {
+                        Handle::new(HalfEdge {
+                            start: vertex.clone(),
+                            is_internal: false,
+                        })
+                    }),
+                    is_internal,
+                );
+                Handle::new(face)
+            })
+            .collect::<Vec<_>>();
+
+        Solid::new([self, other].into_iter().chain(side_faces))
+    }
+}
diff --git a/experiments/2025-03-18/src/operations/flip.rs b/experiments/2025-03-18/src/operations/flip.rs
new file mode 100644
index 000000000..04cc56eb1
--- /dev/null
+++ b/experiments/2025-03-18/src/operations/flip.rs
@@ -0,0 +1,25 @@
+use crate::{
+    object::Handle,
+    topology::{face::Face, surface::Surface},
+};
+
+pub trait FlipExt {
+    fn flip(&self) -> Self;
+}
+
+impl FlipExt for Face {
+    fn flip(&self) -> Self {
+        Face::new(
+            Handle::new(self.surface.flip()),
+            self.half_edges.clone(),
+            self.is_internal,
+        )
+    }
+}
+
+impl FlipExt for Surface {
+    fn flip(&self) -> Self {
+        let geometry = self.geometry.flip();
+        Self { geometry }
+    }
+}
diff --git a/experiments/2025-03-18/src/operations/mod.rs b/experiments/2025-03-18/src/operations/mod.rs
new file mode 100644
index 000000000..7d1d75085
--- /dev/null
+++ b/experiments/2025-03-18/src/operations/mod.rs
@@ -0,0 +1,4 @@
+pub mod connect;
+pub mod flip;
+pub mod sweep;
+pub mod translate;
diff --git a/experiments/2025-03-18/src/operations/sweep.rs b/experiments/2025-03-18/src/operations/sweep.rs
new file mode 100644
index 000000000..3e25eeb7f
--- /dev/null
+++ b/experiments/2025-03-18/src/operations/sweep.rs
@@ -0,0 +1,31 @@
+use crate::{
+    math::Vector,
+    object::Handle,
+    topology::{face::Face, solid::Solid},
+};
+
+use super::{connect::ConnectExt, flip::FlipExt, translate::TranslateExt};
+
+pub trait SweepExt {
+    /// # Sweep a face along a path, creating a solid
+    ///
+    /// ## Implementation Note
+    ///
+    /// This method has very particular (and undocumented) requirements about
+    /// the orientation of the two faces relative to each other, and will
+    /// happily generate invalid geometry, if those undocumented requirements
+    /// aren't met.
+    ///
+    /// It should be seen as more of a placeholder for a real implementation of
+    /// this operation.
+    fn sweep(self, path: impl Into<Vector<3>>) -> Solid;
+}
+
+impl SweepExt for Handle<Face> {
+    fn sweep(self, path: impl Into<Vector<3>>) -> Solid {
+        let bottom = self;
+        let top = Handle::new(bottom.flip().translate(path));
+
+        top.connect(bottom)
+    }
+}
diff --git a/experiments/2025-03-18/src/operations/translate.rs b/experiments/2025-03-18/src/operations/translate.rs
new file mode 100644
index 000000000..9091d7724
--- /dev/null
+++ b/experiments/2025-03-18/src/operations/translate.rs
@@ -0,0 +1,51 @@
+use crate::{
+    math::Vector,
+    object::Handle,
+    topology::{
+        face::Face, half_edge::HalfEdge, surface::Surface, vertex::Vertex,
+    },
+};
+
+pub trait TranslateExt {
+    fn translate(&self, offset: impl Into<Vector<3>>) -> Self;
+}
+
+impl TranslateExt for Face {
+    fn translate(&self, offset: impl Into<Vector<3>>) -> Self {
+        let offset = offset.into();
+
+        Face::new(
+            Handle::new(self.surface.translate(offset)),
+            self.half_edges
+                .iter()
+                .map(|half_edge| Handle::new(half_edge.translate(offset))),
+            self.is_internal,
+        )
+    }
+}
+
+impl TranslateExt for HalfEdge {
+    fn translate(&self, offset: impl Into<Vector<3>>) -> Self {
+        let start = self.start.translate(offset);
+
+        HalfEdge {
+            start: Handle::new(start),
+            is_internal: self.is_internal,
+        }
+    }
+}
+
+impl TranslateExt for Surface {
+    fn translate(&self, offset: impl Into<Vector<3>>) -> Self {
+        let offset = offset.into();
+        let geometry = self.geometry.translate(offset);
+        Self { geometry }
+    }
+}
+
+impl TranslateExt for Vertex {
+    fn translate(&self, offset: impl Into<Vector<3>>) -> Self {
+        let offset = offset.into();
+        Vertex::new(self.point + offset)
+    }
+}
diff --git a/experiments/2025-03-18/src/render/geometry.rs b/experiments/2025-03-18/src/render/geometry.rs
new file mode 100644
index 000000000..144f302bd
--- /dev/null
+++ b/experiments/2025-03-18/src/render/geometry.rs
@@ -0,0 +1,71 @@
+use glam::Vec3;
+use wgpu::util::DeviceExt;
+
+use crate::object::Object;
+
+use super::vertex::Vertex;
+
+pub struct Geometry {
+    pub vertices: wgpu::Buffer,
+    pub indices: wgpu::Buffer,
+    pub num_indices: u32,
+}
+
+impl Geometry {
+    pub fn new(device: &wgpu::Device, operation: &dyn Object) -> Self {
+        let tri_mesh = operation.tri_mesh();
+
+        let mut indices = Vec::new();
+        let mut vertices = Vec::new();
+
+        for triangle in tri_mesh.all_triangles() {
+            let triangle = triangle.points.each_ref().map(|point| {
+                Vec3::from(
+                    point.coords.components.map(|coord| coord.value() as f32),
+                )
+            });
+            let normal = {
+                let [a, b, c] = triangle;
+
+                let ab = b - a;
+                let ac = c - a;
+
+                ab.cross(ac)
+            };
+
+            for point in triangle {
+                let index = vertices.len() as u32;
+                let vertex = Vertex {
+                    position: point.into(),
+                    normal: normal.into(),
+                };
+
+                indices.push(index);
+                vertices.push(vertex);
+            }
+        }
+
+        let Ok(num_indices) = indices.len().try_into() else {
+            panic!("Unsupported number of indices: `{}`", indices.len());
+        };
+
+        let vertices =
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: None,
+                contents: bytemuck::cast_slice(&vertices),
+                usage: wgpu::BufferUsages::VERTEX,
+            });
+        let indices =
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: None,
+                contents: bytemuck::cast_slice(&indices),
+                usage: wgpu::BufferUsages::INDEX,
+            });
+
+        Self {
+            vertices,
+            indices,
+            num_indices,
+        }
+    }
+}
diff --git a/experiments/2025-03-18/src/render/mod.rs b/experiments/2025-03-18/src/render/mod.rs
new file mode 100644
index 000000000..35c43f2e4
--- /dev/null
+++ b/experiments/2025-03-18/src/render/mod.rs
@@ -0,0 +1,8 @@
+mod geometry;
+mod pipeline;
+mod renderer;
+mod text;
+mod uniforms;
+mod vertex;
+
+pub use self::renderer::Renderer;
diff --git a/experiments/2025-03-18/src/render/pipeline.rs b/experiments/2025-03-18/src/render/pipeline.rs
new file mode 100644
index 000000000..22ce834ac
--- /dev/null
+++ b/experiments/2025-03-18/src/render/pipeline.rs
@@ -0,0 +1,145 @@
+use std::f32::consts::PI;
+
+use glam::{Mat4, Vec3};
+use wgpu::util::DeviceExt;
+
+use super::{geometry::Geometry, uniforms::Uniforms, vertex::Vertex};
+
+pub struct Pipeline {
+    render_pipeline: wgpu::RenderPipeline,
+    bind_group: wgpu::BindGroup,
+}
+
+impl Pipeline {
+    pub fn new(
+        device: &wgpu::Device,
+        surface_configuration: &wgpu::SurfaceConfiguration,
+    ) -> Self {
+        let aspect_ratio = surface_configuration.width as f32
+            / surface_configuration.height as f32;
+        let uniforms =
+            device.create_buffer_init(&wgpu::util::BufferInitDescriptor {
+                label: None,
+                contents: bytemuck::cast_slice(&[Uniforms::from_transform(
+                    default_transform(aspect_ratio),
+                )]),
+                usage: wgpu::BufferUsages::UNIFORM,
+            });
+
+        let bind_group_layout =
+            device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+                label: None,
+                entries: &[wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::VERTEX,
+                    ty: wgpu::BindingType::Buffer {
+                        ty: wgpu::BufferBindingType::Uniform,
+                        has_dynamic_offset: false,
+                        min_binding_size: None,
+                    },
+                    count: None,
+                }],
+            });
+
+        let pipeline_layout =
+            device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+                label: None,
+                bind_group_layouts: &[&bind_group_layout],
+                push_constant_ranges: &[],
+            });
+
+        let shader_module = device.create_shader_module(wgpu::include_wgsl!(
+            "shaders/triangles.wgsl"
+        ));
+
+        let render_pipeline =
+            device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+                label: None,
+                layout: Some(&pipeline_layout),
+                vertex: wgpu::VertexState {
+                    module: &shader_module,
+                    entry_point: Some("vertex"),
+                    compilation_options:
+                        wgpu::PipelineCompilationOptions::default(),
+                    buffers: &[wgpu::VertexBufferLayout {
+                        array_stride: size_of::<Vertex>()
+                            as wgpu::BufferAddress,
+                        step_mode: wgpu::VertexStepMode::Vertex,
+                        attributes: Vertex::ATTRIBUTES,
+                    }],
+                },
+                fragment: Some(wgpu::FragmentState {
+                    module: &shader_module,
+                    entry_point: Some("fragment"),
+                    compilation_options:
+                        wgpu::PipelineCompilationOptions::default(),
+                    targets: &[Some(wgpu::ColorTargetState {
+                        format: surface_configuration.format,
+                        blend: Some(wgpu::BlendState::REPLACE),
+                        write_mask: wgpu::ColorWrites::all(),
+                    })],
+                }),
+                primitive: wgpu::PrimitiveState {
+                    topology: wgpu::PrimitiveTopology::TriangleList,
+                    strip_index_format: None,
+                    front_face: wgpu::FrontFace::Ccw,
+                    cull_mode: None,
+                    unclipped_depth: false,
+                    polygon_mode: wgpu::PolygonMode::Fill,
+                    conservative: false,
+                },
+                depth_stencil: Some(wgpu::DepthStencilState {
+                    format: wgpu::TextureFormat::Depth32Float,
+                    depth_write_enabled: true,
+                    depth_compare: wgpu::CompareFunction::Less,
+                    stencil: wgpu::StencilState::default(),
+                    bias: wgpu::DepthBiasState::default(),
+                }),
+                multisample: wgpu::MultisampleState::default(),
+                multiview: None,
+                cache: None,
+            });
+
+        let bind_group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+            label: None,
+            layout: &bind_group_layout,
+            entries: &[wgpu::BindGroupEntry {
+                binding: 0,
+                resource: uniforms.as_entire_binding(),
+            }],
+        });
+
+        Pipeline {
+            render_pipeline,
+            bind_group,
+        }
+    }
+
+    pub fn draw(
+        &self,
+        render_pass: &mut wgpu::RenderPass,
+        geometry: &Geometry,
+    ) {
+        if geometry.num_indices > 0 {
+            render_pass.set_index_buffer(
+                geometry.indices.slice(..),
+                wgpu::IndexFormat::Uint32,
+            );
+            render_pass.set_vertex_buffer(0, geometry.vertices.slice(..));
+            render_pass.set_pipeline(&self.render_pipeline);
+            render_pass.set_bind_group(0, &self.bind_group, &[]);
+            render_pass.draw_indexed(0..geometry.num_indices, 0, 0..1);
+        }
+    }
+}
+
+fn default_transform(aspect_ratio: f32) -> Mat4 {
+    let fov_y_radians = std::f32::consts::PI / 2.;
+    let z_near = 0.1;
+    let z_far = 10.;
+
+    Mat4::perspective_rh(fov_y_radians, aspect_ratio, z_near, z_far)
+        * Mat4::from_translation(Vec3::new(0., 0., -4.))
+        * Mat4::from_rotation_x(-PI / 4.)
+        * Mat4::from_rotation_z(PI / 4.)
+}
diff --git a/experiments/2025-03-18/src/render/renderer.rs b/experiments/2025-03-18/src/render/renderer.rs
new file mode 100644
index 000000000..fdcb123e1
--- /dev/null
+++ b/experiments/2025-03-18/src/render/renderer.rs
@@ -0,0 +1,146 @@
+use std::sync::Arc;
+
+use anyhow::anyhow;
+use winit::window::Window;
+
+use crate::view::OperationView;
+
+use super::{geometry::Geometry, pipeline::Pipeline, text::TextRenderer};
+
+pub struct Renderer {
+    pub surface: wgpu::Surface<'static>,
+    pub device: wgpu::Device,
+    pub queue: wgpu::Queue,
+    pub surface_config: wgpu::SurfaceConfiguration,
+    pub pipeline: Pipeline,
+    pub depth_view: wgpu::TextureView,
+    pub text_renderer: TextRenderer,
+}
+
+impl Renderer {
+    pub async fn new(window: Arc<Window>) -> anyhow::Result<Self> {
+        let instance = wgpu::Instance::default();
+        let surface = instance.create_surface(window.clone())?;
+        let adapter = instance
+            .request_adapter(&wgpu::RequestAdapterOptions {
+                compatible_surface: Some(&surface),
+                ..Default::default()
+            })
+            .await
+            .ok_or_else(|| anyhow!("Failed to request adapter"))?;
+        let (device, queue) = adapter
+            .request_device(
+                &wgpu::DeviceDescriptor {
+                    label: None,
+                    required_features: wgpu::Features::default(),
+                    required_limits: wgpu::Limits::default(),
+                    memory_hints: wgpu::MemoryHints::default(),
+                },
+                None,
+            )
+            .await?;
+
+        let size = window.inner_size();
+        let surface_config = surface
+            .get_default_config(&adapter, size.width, size.height)
+            .ok_or_else(|| anyhow!("Failed to get default surface config"))?;
+        surface.configure(&device, &surface_config);
+
+        let pipeline = Pipeline::new(&device, &surface_config);
+
+        let depth_view = {
+            let depth_texture =
+                device.create_texture(&wgpu::TextureDescriptor {
+                    label: None,
+                    size: wgpu::Extent3d {
+                        width: surface_config.width,
+                        height: surface_config.height,
+                        depth_or_array_layers: 1,
+                    },
+                    mip_level_count: 1,
+                    sample_count: 1,
+                    dimension: wgpu::TextureDimension::D2,
+                    format: wgpu::TextureFormat::Depth32Float,
+                    usage: wgpu::TextureUsages::RENDER_ATTACHMENT
+                        | wgpu::TextureUsages::TEXTURE_BINDING,
+                    view_formats: &[],
+                });
+
+            depth_texture.create_view(&wgpu::TextureViewDescriptor::default())
+        };
+
+        let text_renderer = TextRenderer::new(
+            &device,
+            &queue,
+            &surface_config,
+            window.scale_factor() as f32,
+        );
+
+        Ok(Self {
+            surface,
+            device,
+            queue,
+            surface_config,
+            pipeline,
+            depth_view,
+            text_renderer,
+        })
+    }
+
+    pub fn render(&mut self, operations: &OperationView) -> anyhow::Result<()> {
+        let selected_operation = operations.selected();
+
+        let geometry = Geometry::new(&self.device, selected_operation);
+
+        let mut encoder = self
+            .device
+            .create_command_encoder(&wgpu::CommandEncoderDescriptor::default());
+        let frame = self.surface.get_current_texture().unwrap();
+        let color_view = frame
+            .texture
+            .create_view(&wgpu::TextureViewDescriptor::default());
+
+        {
+            let mut render_pass =
+                encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                    label: None,
+                    color_attachments: &[Some(
+                        wgpu::RenderPassColorAttachment {
+                            view: &color_view,
+                            resolve_target: None,
+                            ops: wgpu::Operations {
+                                load: wgpu::LoadOp::Clear(wgpu::Color::WHITE),
+                                store: wgpu::StoreOp::Store,
+                            },
+                        },
+                    )],
+                    depth_stencil_attachment: Some(
+                        wgpu::RenderPassDepthStencilAttachment {
+                            view: &self.depth_view,
+                            depth_ops: Some(wgpu::Operations {
+                                load: wgpu::LoadOp::Clear(1.0),
+                                store: wgpu::StoreOp::Store,
+                            }),
+                            stencil_ops: None,
+                        },
+                    ),
+                    timestamp_writes: None,
+                    occlusion_query_set: None,
+                });
+
+            self.pipeline.draw(&mut render_pass, &geometry);
+            self.text_renderer.render(
+                operations,
+                &self.device,
+                &self.queue,
+                &self.surface_config,
+                &mut render_pass,
+            )?;
+        }
+
+        self.queue.submit(Some(encoder.finish()));
+        frame.present();
+
+        Ok(())
+    }
+}
diff --git a/experiments/2025-03-18/src/render/shaders/triangles.wgsl b/experiments/2025-03-18/src/render/shaders/triangles.wgsl
new file mode 100644
index 000000000..90e89a92f
--- /dev/null
+++ b/experiments/2025-03-18/src/render/shaders/triangles.wgsl
@@ -0,0 +1,32 @@
+struct Uniforms {
+    transform: mat4x4<f32>,
+    transform_for_normals: mat4x4<f32>,
+};
+
+@group(0) @binding(0)
+var<uniform> uniforms: Uniforms;
+
+struct VertexInput {
+    @location(0) position: vec3<f32>,
+    @location(1) normal: vec3<f32>,
+}
+
+struct VertexOutput {
+    @builtin(position) position: vec4<f32>,
+    @location(0) normal: vec3<f32>,
+}
+
+@vertex
+fn vertex(in: VertexInput) -> VertexOutput {
+    var out: VertexOutput;
+    out.position = uniforms.transform * vec4(in.position, 1.0);
+    out.normal = (uniforms.transform_for_normals * vec4(in.normal, 0.0)).xyz;
+
+    return out;
+}
+
+@fragment
+fn fragment(in: VertexOutput) -> @location(0) vec4<f32> {
+    var color = vec4(in.normal, 1.0);
+    return color;
+}
diff --git a/experiments/2025-03-18/src/render/text.rs b/experiments/2025-03-18/src/render/text.rs
new file mode 100644
index 000000000..bf2e3f369
--- /dev/null
+++ b/experiments/2025-03-18/src/render/text.rs
@@ -0,0 +1,141 @@
+use std::fmt::Write;
+
+use crate::{object::Object, view::OperationView};
+
+pub struct TextRenderer {
+    text_atlas: glyphon::TextAtlas,
+    viewport: glyphon::Viewport,
+    text_renderer: glyphon::TextRenderer,
+    font_system: glyphon::FontSystem,
+    swash_cache: glyphon::SwashCache,
+    scale_factor: f32,
+}
+
+impl TextRenderer {
+    pub fn new(
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        surface_config: &wgpu::SurfaceConfiguration,
+        scale_factor: f32,
+    ) -> Self {
+        let cache = glyphon::Cache::new(device);
+        let swash_cache = glyphon::SwashCache::new();
+
+        let mut text_atlas = glyphon::TextAtlas::new(
+            device,
+            queue,
+            &cache,
+            surface_config.format,
+        );
+
+        let mut viewport = glyphon::Viewport::new(device, &cache);
+        viewport.update(
+            queue,
+            glyphon::Resolution {
+                width: surface_config.width,
+                height: surface_config.height,
+            },
+        );
+
+        let text_renderer = glyphon::TextRenderer::new(
+            &mut text_atlas,
+            device,
+            wgpu::MultisampleState::default(),
+            Some(wgpu::DepthStencilState {
+                format: wgpu::TextureFormat::Depth32Float,
+                depth_write_enabled: true,
+                depth_compare: wgpu::CompareFunction::Less,
+                stencil: wgpu::StencilState::default(),
+                bias: wgpu::DepthBiasState::default(),
+            }),
+        );
+
+        let font_system = glyphon::FontSystem::new();
+
+        Self {
+            text_atlas,
+            viewport,
+            text_renderer,
+            font_system,
+            swash_cache,
+            scale_factor,
+        }
+    }
+
+    pub fn render(
+        &mut self,
+        operations: &OperationView,
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        surface_config: &wgpu::SurfaceConfiguration,
+        render_pass: &mut wgpu::RenderPass,
+    ) -> anyhow::Result<()> {
+        let mut buffer = glyphon::Buffer::new(
+            &mut self.font_system,
+            glyphon::Metrics {
+                font_size: 16.,
+                line_height: 16.,
+            },
+        );
+
+        for (op, selected, indent_level) in operations.operations() {
+            let mut attrs = glyphon::Attrs::new();
+
+            if selected {
+                attrs = attrs.color(glyphon::Color::rgb(0, 127, 0));
+            }
+
+            let mut line = String::new();
+
+            for _ in 0..indent_level {
+                write!(line, "\t")?;
+            }
+
+            write!(line, "{}", op.label())?;
+
+            buffer.lines.push(glyphon::BufferLine::new(
+                line,
+                glyphon::cosmic_text::LineEnding::Lf,
+                glyphon::AttrsList::new(attrs),
+                glyphon::Shaping::Advanced,
+            ));
+        }
+
+        buffer.shape_until_scroll(&mut self.font_system, false);
+
+        let text_area = glyphon::TextArea {
+            buffer: &buffer,
+            left: 0.,
+            top: 0.,
+            scale: self.scale_factor,
+            bounds: glyphon::TextBounds {
+                left: 0,
+                top: 0,
+                right: surface_config.width as i32,
+                bottom: surface_config.height as i32,
+            },
+            default_color: glyphon::Color::rgb(0, 0, 0),
+            custom_glyphs: &[],
+        };
+
+        self.text_renderer
+            .prepare(
+                device,
+                queue,
+                &mut self.font_system,
+                &mut self.text_atlas,
+                &self.viewport,
+                [text_area],
+                &mut self.swash_cache,
+            )
+            .unwrap();
+
+        self.text_renderer.render(
+            &self.text_atlas,
+            &self.viewport,
+            render_pass,
+        )?;
+
+        Ok(())
+    }
+}
diff --git a/experiments/2025-03-18/src/render/uniforms.rs b/experiments/2025-03-18/src/render/uniforms.rs
new file mode 100644
index 000000000..c533b0738
--- /dev/null
+++ b/experiments/2025-03-18/src/render/uniforms.rs
@@ -0,0 +1,19 @@
+use glam::Mat4;
+
+#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
+#[repr(C)]
+pub struct Uniforms {
+    pub transform: Mat4,
+    pub transform_for_normals: Mat4,
+}
+
+impl Uniforms {
+    pub fn from_transform(transform: Mat4) -> Self {
+        let transform_for_normals = transform.inverse().transpose();
+
+        Self {
+            transform,
+            transform_for_normals,
+        }
+    }
+}
diff --git a/experiments/2025-03-18/src/render/vertex.rs b/experiments/2025-03-18/src/render/vertex.rs
new file mode 100644
index 000000000..9003fdea4
--- /dev/null
+++ b/experiments/2025-03-18/src/render/vertex.rs
@@ -0,0 +1,13 @@
+#[derive(Clone, Copy, bytemuck::Pod, bytemuck::Zeroable)]
+#[repr(C)]
+pub struct Vertex {
+    pub position: [f32; 3],
+    pub normal: [f32; 3],
+}
+
+impl Vertex {
+    pub const ATTRIBUTES: &[wgpu::VertexAttribute] = &wgpu::vertex_attr_array![
+        0 => Float32x3,
+        1 => Float32x3,
+    ];
+}
diff --git a/experiments/2025-03-18/src/topology/face.rs b/experiments/2025-03-18/src/topology/face.rs
new file mode 100644
index 000000000..5fadd4d55
--- /dev/null
+++ b/experiments/2025-03-18/src/topology/face.rs
@@ -0,0 +1,58 @@
+use std::fmt;
+
+use itertools::Itertools;
+
+use crate::{
+    extra::triangulate::triangulate,
+    geometry::TriMesh,
+    object::{Handle, HandleAny, Object},
+};
+
+use super::{half_edge::HalfEdge, surface::Surface, vertex::Vertex};
+
+#[derive(Debug)]
+pub struct Face {
+    pub surface: Handle<Surface>,
+    pub half_edges: Vec<Handle<HalfEdge>>,
+    pub is_internal: bool,
+}
+
+impl Face {
+    pub fn new(
+        surface: Handle<Surface>,
+        half_edges: impl IntoIterator<Item = Handle<HalfEdge>>,
+        is_internal: bool,
+    ) -> Self {
+        Self {
+            surface,
+            half_edges: half_edges.into_iter().collect(),
+            is_internal,
+        }
+    }
+
+    pub fn half_edges_with_end_vertex(
+        &self,
+    ) -> impl Iterator<Item = (&Handle<HalfEdge>, &Handle<Vertex>)> {
+        self.half_edges
+            .iter()
+            .circular_tuple_windows()
+            .map(|(a, b)| (a, &b.start))
+    }
+}
+
+impl Object for Face {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Face")
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        triangulate(self)
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        self.half_edges
+            .iter()
+            .map(|vertex| vertex.to_any())
+            .collect()
+    }
+}
diff --git a/experiments/2025-03-18/src/topology/half_edge.rs b/experiments/2025-03-18/src/topology/half_edge.rs
new file mode 100644
index 000000000..9bf0a5849
--- /dev/null
+++ b/experiments/2025-03-18/src/topology/half_edge.rs
@@ -0,0 +1,27 @@
+use std::fmt;
+
+use crate::{
+    geometry::TriMesh,
+    object::{Handle, HandleAny, Object},
+};
+
+use super::vertex::Vertex;
+
+pub struct HalfEdge {
+    pub start: Handle<Vertex>,
+    pub is_internal: bool,
+}
+
+impl Object for HalfEdge {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "HalfEdge")
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        TriMesh::new()
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        vec![self.start.to_any()]
+    }
+}
diff --git a/experiments/2025-03-18/src/topology/mod.rs b/experiments/2025-03-18/src/topology/mod.rs
new file mode 100644
index 000000000..00bb5a849
--- /dev/null
+++ b/experiments/2025-03-18/src/topology/mod.rs
@@ -0,0 +1,5 @@
+pub mod face;
+pub mod half_edge;
+pub mod solid;
+pub mod surface;
+pub mod vertex;
diff --git a/experiments/2025-03-18/src/topology/solid.rs b/experiments/2025-03-18/src/topology/solid.rs
new file mode 100644
index 000000000..0c0938d14
--- /dev/null
+++ b/experiments/2025-03-18/src/topology/solid.rs
@@ -0,0 +1,41 @@
+use std::fmt;
+
+use crate::{
+    geometry::TriMesh,
+    object::{Handle, HandleAny, Object},
+};
+
+use super::face::Face;
+
+#[derive(Clone)]
+pub struct Solid {
+    faces: Vec<Handle<Face>>,
+}
+
+impl Solid {
+    pub fn new(faces: impl IntoIterator<Item = Handle<Face>>) -> Self {
+        Self {
+            faces: faces.into_iter().collect(),
+        }
+    }
+}
+
+impl Object for Solid {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Solid")
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        let mut tri_mesh = TriMesh::new();
+
+        for face in &self.faces {
+            tri_mesh = tri_mesh.merge(face.tri_mesh());
+        }
+
+        tri_mesh
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        self.faces.iter().map(|face| face.to_any()).collect()
+    }
+}
diff --git a/experiments/2025-03-18/src/topology/surface.rs b/experiments/2025-03-18/src/topology/surface.rs
new file mode 100644
index 000000000..7b3f58def
--- /dev/null
+++ b/experiments/2025-03-18/src/topology/surface.rs
@@ -0,0 +1,15 @@
+use std::fmt;
+
+use crate::geometry::SurfaceGeometry;
+
+pub struct Surface {
+    pub geometry: Box<dyn SurfaceGeometry>,
+}
+
+impl fmt::Debug for Surface {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Surface")
+            .field("geometry", &"Box<dyn SurfaceGeometry>")
+            .finish()
+    }
+}
diff --git a/experiments/2025-03-18/src/topology/vertex.rs b/experiments/2025-03-18/src/topology/vertex.rs
new file mode 100644
index 000000000..65a7a8b03
--- /dev/null
+++ b/experiments/2025-03-18/src/topology/vertex.rs
@@ -0,0 +1,33 @@
+use std::fmt;
+
+use crate::{
+    geometry::TriMesh,
+    math::Point,
+    object::{HandleAny, Object},
+};
+
+#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct Vertex {
+    pub point: Point<3>,
+}
+
+impl Vertex {
+    pub fn new(point: impl Into<Point<3>>) -> Self {
+        let point = point.into();
+        Self { point }
+    }
+}
+
+impl Object for Vertex {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "Vertex")
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        TriMesh::new()
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        Vec::new()
+    }
+}
diff --git a/experiments/2025-03-18/src/view.rs b/experiments/2025-03-18/src/view.rs
new file mode 100644
index 000000000..35a4e1a05
--- /dev/null
+++ b/experiments/2025-03-18/src/view.rs
@@ -0,0 +1,136 @@
+use std::{fmt, iter};
+
+use crate::{
+    geometry::TriMesh,
+    object::{HandleAny, Object},
+};
+
+#[derive(Clone)]
+pub struct OperationView {
+    operation: HandleAny,
+    children: Vec<Self>,
+    selected: Option<usize>,
+}
+
+impl OperationView {
+    pub fn new(operation: HandleAny) -> Self {
+        let children =
+            operation.children().into_iter().map(Self::new).collect();
+
+        Self {
+            operation,
+            children,
+            selected: None,
+        }
+    }
+
+    pub fn operations(&self) -> impl Iterator<Item = (&Self, bool, usize)> {
+        self.operations_inner(true, 0)
+    }
+
+    fn operations_inner(
+        &self,
+        selected: bool,
+        indent_level: usize,
+    ) -> Box<dyn Iterator<Item = (&Self, bool, usize)> + '_> {
+        let self_ = iter::once((self, selected, indent_level));
+
+        if self.selected.is_some() {
+            Box::new(self_.chain(self.children.iter().enumerate().flat_map(
+                move |(i, view)| {
+                    let selected = Some(i) == self.selected;
+                    view.operations_inner(selected, indent_level + 1)
+                },
+            )))
+        } else {
+            Box::new(self_)
+        }
+    }
+
+    pub fn select_last(&mut self) {
+        self.selected = Some(self.last_index());
+    }
+
+    pub fn select_next(&mut self) {
+        if let Some(selected) = self.selected {
+            self.selected = Some(usize::min(selected + 1, self.last_index()));
+        }
+    }
+
+    pub fn select_previous(&mut self) {
+        if let Some(selected) = self.selected {
+            self.selected = Some(selected.saturating_sub(1));
+        }
+    }
+
+    pub fn select_none(&mut self) {
+        self.selected = None;
+    }
+
+    pub fn selected(&self) -> &Self {
+        self.selected
+            .and_then(|selected| self.children.get(selected))
+            .map(|child| child.selected())
+            .unwrap_or(self)
+    }
+
+    pub fn selected_mut(&mut self) -> &mut Self {
+        let Some(selected) = self.selected else {
+            return self;
+        };
+
+        // The way this is done, first checking for `is_none` and then
+        // `unwrap`ing below, is really ugly. But the borrow checker is forcing
+        // my hand.
+        //
+        // I've tried several variations of matching, and it can't see that in
+        // the `None` case, `self` no longer needs to be borrowed, preventing me
+        // from returning it.
+
+        if self.children.get_mut(selected).is_none() {
+            return self;
+        };
+
+        self.children.get_mut(selected).unwrap().selected_mut()
+    }
+
+    pub fn parent_of_selected_mut(&mut self) -> &mut Self {
+        let Some(selected) = self.selected else {
+            return self;
+        };
+
+        // The same comment in `selected_mut` applies here too. Plus, some ugly
+        // duplication.
+
+        if self.children.get_mut(selected).is_none() {
+            return self;
+        };
+
+        if self.children.get_mut(selected).unwrap().selected.is_none() {
+            self
+        } else {
+            self.children
+                .get_mut(selected)
+                .unwrap()
+                .parent_of_selected_mut()
+        }
+    }
+
+    fn last_index(&self) -> usize {
+        self.children.len().saturating_sub(1)
+    }
+}
+
+impl Object for OperationView {
+    fn display(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.operation.display(f)
+    }
+
+    fn tri_mesh(&self) -> TriMesh {
+        self.operation.tri_mesh()
+    }
+
+    fn children(&self) -> Vec<HandleAny> {
+        self.operation.children()
+    }
+}