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An optical illusion in which long parallel lines appear to diverge or converge when crossed by rows of short oblique lines.‘The Poggendorff illusion was actually derived from another famous illusion - the Zöllner illusion.’‘It may be that the Zöllner illusion is caused by this impression of depth.’
Late 19th century named after Johann K. F. Zöllner (1834–82), German physicist.
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