This page may take a minute to load, due to the large number of graphics. The wait will be well worth it. The geometry here is impossible, yet this structure is real and three dimensional. The photo has not been retouched.
People have a difficult time perceiving faces when they are upside down.
This is a picture of a pretty lady. Stare at the four dots in the middle of this picture for 30 seconds, without blinking. Then close your eyes and lean your head back, facing a source of light. Click on the button for a clue. If these Optical Illusions amused you, click the button below to send them to all your friends.