Wundt illusion

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A visual illusion in which a pair of straight lines appear to be bowed inwards when superimposed on a pattern of lines converging to points on either side of them (see illustration). It is closely related to the Hering illusion. [Named after the German psychologist Wilhelm (Max) Wundt (1832–1920) who first published it in 1896]

Wundt illusion. The two horizontal lines are straight.

Subjects: Psychology.

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