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Meaning of Zollner illusion

Zoll'ner illu'sion

Pronunciation: (tsul'nur Ger. tsœl'nur), [key]
— Psychol. Psychol.
  1. a spatial illusion in which parallel lines intersected by short oblique lines are perceived as converging or diverging.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.