diff --git a/main_bounce.cpp b/main_bounce.cpp
index b1849e8..61b9f96 100644
--- a/main_bounce.cpp
+++ b/main_bounce.cpp
@@ -18,10 +18,12 @@ int main(int argc, char** argv) {
     Ball ball(Point(0, 5, 0), flat, 0.75, -0.5, -0.7, 1, 1);
 
     Cuboid bbox = ball.get_surface()->max_bounding_box();
+    Cuboid bbox_2(Point(-2, -1, -2), Point(2,1,2));
     printf("%.2lf %.2lf %.2lf | %.2lf %.2lf %.2lf\n",
             bbox.low(0), bbox.low(1), bbox.low(2),
             bbox.high(0), bbox.high(1), bbox.high(2));
     render.add_surface(ball.get_surface(), bbox);
+    render.add_surface(flat->get_surface(), bbox_2);
 
     render.set_idle_func(periodic_update);
     init_periodic_static(&ball);