Optical

• IllusionWorks - be prepared to be fooled, puzzled, duped, and just plain weirded out.
• Kaleidoscope Heaven - kaleidoscope collecting, history, and pictures.
• Magic Eye - learn how to see in 3D.
• Parallel-Viewing Stereo Photographs - learn how to see 3D. Includes photos for practicing.
• Stereogram of the Week - can you see the secret image?
• World of Escher - a gallery of works by M.C. Escher plus related computer products.