diff --git a/tdkpin-rs/src/table.rs b/tdkpin-rs/src/table.rs
index 9428983..db84393 100644
--- a/tdkpin-rs/src/table.rs
+++ b/tdkpin-rs/src/table.rs
@@ -215,6 +215,7 @@ pub const BUMPERS: [StaticCircle; 3] = [
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::geometry::{circle_collision, segment_collision};
 
     #[test]
     fn recovered_object_inventory_is_complete() {
@@ -238,4 +239,65 @@ mod tests {
         assert_eq!(shooter_wall.segment.start, Vec2::new(328.0, 422.0));
         assert_eq!(shooter_wall.segment.end, Vec2::new(328.0, 58.0));
     }
+
+    #[test]
+    fn every_recovered_wall_has_a_working_contact_surface_on_both_sides() {
+        for wall in WALLS {
+            let line = wall.segment.end - wall.segment.start;
+            assert!(
+                line.length_squared() > 0.0,
+                "object {} is degenerate",
+                wall.id
+            );
+            let normal = Vec2::new(-line.y, line.x).normalize();
+            let midpoint = (wall.segment.start + wall.segment.end) * 0.5;
+
+            for side in [-1.0, 1.0] {
+                let outward = normal * side;
+                let mut position = midpoint + outward * 0.5;
+                let mut velocity = -outward * 430.0;
+                let hit = segment_collision(&mut position, &mut velocity, 1.0, wall.segment);
+
+                assert!(hit, "object {} missed its midpoint contact", wall.id);
+                assert!(
+                    velocity.dot(outward) >= 0.0,
+                    "object {} did not reject an inward trajectory",
+                    wall.id
+                );
+                assert!(
+                    position.distance(midpoint) >= 0.99,
+                    "object {} did not separate the ball from its surface",
+                    wall.id
+                );
+            }
+        }
+    }
+
+    #[test]
+    fn every_recovered_circle_separates_and_reflects_the_ball() {
+        for circle in PASSIVE_CIRCLES.iter().chain(BUMPERS.iter()) {
+            let mut position = circle.center + Vec2::new(circle.contact_radius - 0.5, 0.0);
+            let mut velocity = Vec2::new(-430.0, 0.0);
+            let hit = circle_collision(
+                &mut position,
+                &mut velocity,
+                0.0,
+                circle.center,
+                circle.contact_radius,
+                0.0,
+            );
+
+            assert!(hit, "object {} missed an overlapping ball", circle.id);
+            assert!(
+                position.x >= circle.center.x + circle.contact_radius,
+                "object {} did not separate the ball",
+                circle.id
+            );
+            assert!(
+                velocity.x > 0.0,
+                "object {} did not reflect inward velocity",
+                circle.id
+            );
+        }
+    }
 }