Rep Your Favourite (Optical Illusion Related)

BeatChemist

This just made my face hurt a few minutes ago.Post up your favourite!

pjl2000xl

http://www.grand-illusions.com/programs/Optical.exe
this shit is real cool. you look at the lil dot in the center for 30 seconds or more then look away and it feels like you took a hit of acid. Try it for yourself.

BreakSelf

piedpiper

focus the lttle cross in the middle for a while...

mannybolone

Here's a modern classic:

http://www.eyetricks.com/scary_optical_illusion2.htm