Hering illusion

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Notion

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Science and technology

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What Wikipedia says

The Hering illusion is one of the geometrical-optical illusions and was discovered by the German physiologist Ewald Hering in 1861. When two straight and parallel lines are presented in front of a radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards.

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

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