diff --git a/html/images/space.svg b/html/images/space.svg
index e2dd591..4b37c2c 100644
--- a/html/images/space.svg
+++ b/html/images/space.svg
@@ -75,12 +75,16 @@
 
   <!-- <polygon class="wall" points="20,20 40,20 40,40 20,40" /> -->
   <!-- <polygon class="wall" points="-10,-30 -10,-40 30,-50 60,-30 80,0 150,0 150,10 60,50 -10,40 -20,20 20,20 20,-20" /> -->
-  <!-- <polygon class="wall" points="-130,-80 -40,-70 -70,-10 -100,40 -120,100" /> -->
+  <!-- <g> -->
+  <!--   <polygon class="wall" points="-130,-80 -40,-70 -70,-10" /> -->
+  <!--   <polygon class="wall" points="50,70 90,-10 130,70" /> -->
+  <!-- </g> -->
+
   <g>
     <polygon class="wall" points="-130,-80 -40,-70 -70,-10" />
     <polygon class="wall" points="50,70 90,-10 130,70" />
+    <polygon class="wall" points="-130,100 -70,50 -40,110" />
   </g>
-
   <g id="triangles"></g>
   <g id="edges"></g>
   <g id="bullets"></g>
@@ -120,7 +124,7 @@
     const halfPi = Math.PI / 2;
     const maxSpeed = 100;
 
-    const drawCollisionLines = true;
+    const drawCollisionLines = false;
 
     let previous, zero, frameCount = 0;
     let position = [0, 0]; // meters