diff --git a/cooperative_cuisine/counters.py b/cooperative_cuisine/counters.py
index 97dd339359c6887ffad601782084813cae5eaefe..eb39a753b95e938c077def8ebd36697bcef37eac 100644
--- a/cooperative_cuisine/counters.py
+++ b/cooperative_cuisine/counters.py
@@ -333,6 +333,10 @@ class Counter:
         }
 
 
+class EdgeCounter(Counter):
+    ...
+
+
 class CuttingBoard(Counter):
     """Cutting ingredients on. The requirement in a new object could look like.
 
diff --git a/cooperative_cuisine/pygame_2d_vis/images/wall.png b/cooperative_cuisine/pygame_2d_vis/images/wall.png
new file mode 100644
index 0000000000000000000000000000000000000000..9a7173aebc63094bae6d1618f48d6d188974dff8
Binary files /dev/null and b/cooperative_cuisine/pygame_2d_vis/images/wall.png differ