Wolfram Demonstrations Project
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Spiral or Not?

This Demonstration shows an optical illusion known as Fraser's Spiral. While the image appears to be a spiral formed by a rope containing twisted strands, by moving the slider you can see that this is false.

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"Spiral or Not?" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/SpiralOrNot/
Contributed by: Enrique Zeleny
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