Surfing the net for these ignunt links so that ya’ll don’t have to…. 
Cool optical illusion.
If you stare at the cross in the middle of the blinking purple dots, the dots will turn green and disappear. However, if you look again at the purple dots, you will see they only flash for a second and are never green.
http://photos32.flickr.com/37017144_072d69c441_o.gif
This one phuques me up too
http://www.michaelbach.de/ot/fcs_hollow-face/index.html
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