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Oppel-Kundt illusion

From Wiktionary, the free dictionary

English

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The part of the figure filled with some elements (upper, discretely; lower, continuously) seems longer than the unfilled part of the same length.

Etymology

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Named after German physicists Johann Joseph Oppel and August Kundt.

Noun

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Oppel-Kundt illusion (plural Oppel-Kundt illusions)

  1. An optical illusion that occurs when comparing the sizes of filled and unfilled parts of an image.
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