Poggendorff illusion

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A visual illusion in which a diagonal line appears displaced when interrupted by a rectangle appearing to occlude the middle part of it (see illustration). [Named after the German physicist Johann Christian Poggendorff (1796–1877) who discovered it, although the German astronomer Johann Karl Friedrich Zöllner (1834–82) first published it in 1860 after Poggendorff had drawn his attention to it]

Poggendorff illusion. The lower of the two lines on the right is a continuation of the line on the left.

Subjects: Psychology.

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