Wundt illusion

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Science and technology

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What Wikipedia says

The Wundt illusion is a geometrical-optical illusion, a class of visual phenomena in which the perceived properties of simple lines or shapes differ from their true geometric properties. It was first described by the German psychologist Wilhelm Wundt in 1898.

Excerpt from the Wikipedia article “Wundt illusion”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Fibonacci, CC BY-SA 3.0, via Wikimedia Commons.