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Hering illusion

a misperception that occurs when two parallel straight lines are superimposed on a pattern of lines that radiate from a central point. When the two lines are placed equidistant from one another on opposite sides of the center point, they appear to be bowed outward from the center, rather than straight. Also called Hering–Helmholtz illusion. [Ewald Hering; Hermann von Helmholtz]

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February 2nd 2025

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