Optical Illusion

On the way home from G&G's house tonight, Trevor commented that I had a third eye in the middle of my forehead when he looked at me through the rear view mirror. We discussed optical illusions a little bit then Tyson piped up: "It's when you do the luge but on mirrors instead of ice." He has been fascinated with the Luge since we watched them a bit during the Olympics. Guess my explanation didn't quite cut it.