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Zöllner illusion


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n.

A visual illusion in which parallel straight lines appear to converge and diverge alternately when intersected by a herring-bone pattern of oblique stripes (see illustration). [Named after the German astronomer Johann Karl Friedrich Zöllner (1834–82) who first reported it in 1860 after observing it in the pattern of a piece of dressmaking fabric]

Zöllner illusion. The long lines are straight and parallel.

Subjects: Psychology.


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