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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