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posted by Jason Kottke  ·  gift link

Rotating Circles Optical Illusion

This is one of the best optical illusions I’ve ever seen: aside from rotating, these circles don’t move.

The left/right/up/down arrows were freaky enough but the in & out arrows really blew a gasket in my brain. For proof that the circles don’t move, blink your eyes quickly as you watch or check out this gif. (via @jagarikin)