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Café Wall Illusion
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The horizontal lines in the café wall pattern above appear to be sloped, but in reality they are perfectly parallel.

ReferenceReferences

[1] R. L. Gregory and P. Heard, "Border locking and the Café Wall illusion," Perception, vol. 8, pp. 365-380, 1979.
[2] D. P. Lulich and K. A. Stevens, "Differential contributions of circular and elongated spatial filters to the Café Wall illusion," Biological Cybernetics, vol. 61, pp. 427-435, 1989.