Here is an awesome optical illusion, that involves watching a rotating spiral then looking at ones hand (via Hotlinks, flash).
This led me to Michael Bach's site which has tons of motion-related illusions, including my grandpa's "Enigma".
Akiyoshi Kitaoka authored other very effective motion-related illusions (via Boing Boing).
Argh. Some of these illusions just don't work very well for me. I don't know why.
Here's another cool optical illusions link for ya!
optical illusionsPosted by: Optical Illusions (January 3, 2005 12:58 PM)