Vertical-Horizontal Illusion
The Horizontal line segment in the above figure appears to be shorter than the Vertical line segment, despite thefact that it has the same length.
See also Illusion, Müller-Lyer Illusion, Poggendorff Illusion, Ponzo's Illusion
References
Fineman, M. The Nature of Visual Illusion. New York: Dover, p. 153, 1996.
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