The Shadow of the Dog

Is it the shadow of the dog, the wolf, the werewolf, or man himself that looms with his dual personality and bestial nature? The answer is in a cube. A black cube stands on its edge, balanced on a transparent plane. A man standing on the plane holds one of the cube's edges. The man shouts "I can push it over. I can push it over." The shadow of the dog looms over the man. With fiery eyes he wrestles with the dog.