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Irradiation Illusion
Can your eyes deceive you? Adjust the size of the white polygon on the right until you think it is equal to the black polygon on the left. Then check your selection by moving the white polygon over the black one. This illusion was discovered by Helmholtz in the century.




"Irradiation Illusion" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/IrradiationIllusion/
Contributed by: Sándor Kabai
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