Sunday, July 15, 2007

One of my favorite optical illusions

Here's a really strange one. Stare at the girl's shadow for about 30 seconds and she will start rotating the other way. She isn't really of course, but you may have to close your eyes to get her going anti-clockwise again.

If you look at the foot nearest the floor, and only at that foot, you'll see it's simply oscillating back and forth. Question: Why do you perceive her spinning clockwise? It's a flat figure with no changing highlights to supplement your intuition.

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