2007
finalist

Swimmers, Eels and Other Gradient-Gradient Illusions

Emily Knight & Arthur Shapiro

Bucknell University, USA
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(© 2007 Emily Knight and Arthur Shapiro)

The red button adds/removes half of the background grating. The swimmers bob up and down when they are in front of the grating but not when they are in front of a uniform background

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Read more about the illusion and possible explanations

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Swimmers, Eels and Other Gradient-Gradient Illusions8.51067

Tags: , , | Presented Saturday, May 12th, 2007 |


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