Hering illusion

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A visual illusion in which a pair of parallel straight lines appear to be bowed outwards when superimposed on a series of straight lines radiating like spokes of a wheel from a central point between the parallel lines (see illustration). It is closely related to the Wundt illusion. [First reported in 1861 by the German psychologist and physiologist Ewald Hering (1834–1918)]

Hering illusion. The vertical lines are straight and parallel.

Subjects: Psychology.

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