Amazing optical illusion and Spirograph

UntitledPhil "Bad Astronomy" Plait deconstructs Brusspup's "Crazy Circle Illusion" and ties it to the wonderful classic art/science/toy Spirograph.

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  1. "did you know that there's a direct correlation between the decline of Spirograph and the rise in gang activity? Think about it."

  2. It's a fun illusion, no mistake.

    But I had an actual Spirograph, back in the day, and as memory serves (it's been a l - o - n - g time), you would only get that result if the inner wheel had exactly half the teeth of the outer ring, and the pen were positioned at the exact outer edge of the inner wheel..

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