Café wall illusion

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Notion

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Science and technology

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What Wikipedia says

The café wall illusion (also known as the Münsterberg illusion or the kindergarten illusion) is a geometrical-optical illusion in which the parallel straight dividing lines between staggered rows with alternating dark and light rectangles (such as bricks or tiles) appear to be sloped, not parallel as they really are.

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

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