Undeniable Friday

Friday, July 21, 2006

It's Undeniable Friday! Every Friday, in addition to an odd little factoid, UndeniableFacts.com gives you a fun puzzle, illusion, or activity to enjoy and share.

Today an illusion:

Stare at the crosshair in the middle of the image for about 30 seconds:

Now, still keeping your eyes on that crosshair, wave your hand in front of your face.

Do you see why the Ancients called this effect Athena's Fan?


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