diff --git a/src/main.rs b/src/main.rs
index 48885b5..107a070 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -35,6 +35,7 @@ const FG: Color		= Color::new(0.7686, 0.7216, 0.4078, 1.0);
 const SPEED: f64	= 0.1;
 const BOING_RADIUS: f64    = 30.0;
 const LIGHT_RADIUS: f32 = 128.;
+const WALL_THICKNESS: f32 = 5.;
 
 #[macroquad::main("BasicShapes")]
 async fn main() {
@@ -90,7 +91,18 @@ async fn main() {
 			let w1 = w1.as_f32();
 			let w2 = w2.as_f32();
 			if shadows::wall_needs_to_be_drawn(w1, w2, mouse_position, LIGHT_RADIUS) {
-				shadows::draw_wall(w1, w2, mouse_position, LIGHT_RADIUS);
+				let perpendicular = (w1 - w2).perp();
+				let shift = perpendicular / perpendicular.length() * WALL_THICKNESS;
+				let points = [
+					w1 + shift,
+					w1 - shift,
+					w2 + shift,
+					w2 - shift,
+				];
+				shadows::draw_wall(points[0], points[1], mouse_position, LIGHT_RADIUS);
+				shadows::draw_wall(points[1], points[2], mouse_position, LIGHT_RADIUS);
+				shadows::draw_wall(points[2], points[3], mouse_position, LIGHT_RADIUS);
+				shadows::draw_wall(points[3], points[0], mouse_position, LIGHT_RADIUS);
 			}
 		}