Found some interesting illusions today. This first one will drive you INSANE. The squares marked A and B are the same shade of gray (I checked with Photoshop).
For other fun illusions, visit this guy’s web page:
Be careful though, your eyes might pop out of your head or something similarly unpleasant. Enjoy at your own risk!
-Keithius
Dude! That checker-shadow illusion is wild!