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An optical Illusion in which the orientation of arrowheads makes one Line Segment look longer than another. In the above figure, the Line Segments on the left and right are of equal length in both cases.
See also Illusion, Poggendorff Illusion, Ponzo's Illusion, Vertical-Horizontal Illusion
References
Fineman, M. The Nature of Visual Illusion. New York: Dover, p. 153, 1996.
Luckiesh, M. Visual Illusions: Their Causes, Characteristics & Applications. New York:
Dover, p. 93, 1965.