Blindspot
Ivan | Sat, 2006-06-03 16:001 - center your head on the screen
2 - close your left eye
3 - stare at the ball with your right eye
4 - on your peripheral vision see what happens to the cross
via digg.com
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The link's dead.
Here's a working link that explains how to do the test, and why it happens. That's crazy, and kind of spooky...hahah!