diff --git a/src/bin/flat.rs b/src/bin/flat.rs
index 063cb8d..2fc69a9 100644
--- a/src/bin/flat.rs
+++ b/src/bin/flat.rs
@@ -10,16 +10,22 @@ pub fn main() {
 		coil_w: 50.0,
 		coil_m: 10.0,
 	};
+	let space = Rect {
+		box_scale: 3.0,
+		box_a: vec2(- 30.0, - 300.0),
+		box_b: vec2(30.0, 300.0),
+		box_m: vec2(20.0, 50.0),
+	};
 	with_2d_graphics(move || {
 		let canvas = create_drawing_window("Refraction");
 		canvas.draw(|gc| {
 			gc.canvas_height(1000.0);
 
 			gc.new_path();
-			gc.circle(0.0, 0.0, space.coil_r + space.coil_w + space.coil_m);
-			gc.circle(0.0, 0.0, space.coil_r + space.coil_w);
-			gc.circle(0.0, 0.0, space.coil_r - space.coil_w);
-			gc.circle(0.0, 0.0, space.coil_r - space.coil_w - space.coil_m);
+			//gc.circle(0.0, 0.0, space.coil_r + space.coil_w + space.coil_m);
+			//gc.circle(0.0, 0.0, space.coil_r + space.coil_w);
+			//gc.circle(0.0, 0.0, space.coil_r - space.coil_w);
+			//gc.circle(0.0, 0.0, space.coil_r - space.coil_w - space.coil_m);
 			gc.winding_rule(WindingRule::EvenOdd);
 			gc.fill_color(Color::Rgba(0.8, 0.8, 0.8, 1.0));
 			gc.fill();
@@ -29,10 +35,10 @@ pub fn main() {
 			for y in itertools_num::linspace(-1.0, 1.0, 101) {
 				draw_ray(gc, &space, vec2(-500.0, 0.0), vec2(1.0, y));
 			}
-			gc.stroke_color(Color::Rgba(0.0, 0.5, 1.0, 1.0));
-			for y in itertools_num::linspace(-1.0, 1.0, 101) {
-				draw_ray(gc, &space, vec2(0.0, space.coil_r), vec2(1.0, y));
-			}
+			// gc.stroke_color(Color::Rgba(0.0, 0.5, 1.0, 1.0));
+			// for y in itertools_num::linspace(-1.0, 1.0, 101) {
+			// 	draw_ray(gc, &space, vec2(0.0, space.coil_r), vec2(1.0, y));
+			// }
 		});
 	});
 }
@@ -75,6 +81,23 @@ impl Metric for Coil {
 	}
 }
 
+struct Rect {
+	 box_scale: f32,
+	 box_a: Vec2,
+	 box_b: Vec2,
+	 box_m: Vec2,
+}
+
+impl Metric for Rect {
+	fn halfmetric(&self, pos: Vec2) -> Decomp2 {
+		let s = smoothbox(pos.x, vec2(self.box_a.x, self.box_b.x), self.box_m.x) * smoothbox(pos.y, vec2(self.box_a.y, self.box_b.y), self.box_m.y);
+		Decomp2{
+			ortho: Mat2::IDENTITY,
+			diag: vec2(1.0, self.box_scale.powf(-s)),
+		}
+	}
+}
+
 mod riemann {
 	use glam::*;