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Vertical-Horizontal Illusion


The Horizontal line segment in the above figure appears to be shorter than the Vertical line segment, despite the fact that it has the same length.

See also Illusion, Müller-Lyer Illusion, Poggendorff Illusion, Ponzo's Illusion


Fineman, M. The Nature of Visual Illusion. New York: Dover, p. 153, 1996.

© 1996-9 Eric W. Weisstein