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Jastrow Illusion
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Shape B appears to be larger than Shape A, but if you drag one of them over the other you will see that they are actually the same size.

ReferenceReferences

[1] J. Jastrow, "A study of Zöllner's figures and other related illusions," American Journal of Psychology, vol. 4, pp. 381-398, 1891.
[2] R. A. M. Gregson, Cascades and Fields in Perceptual Psychophysics. Singapore: World Scientific Publishing Company, 1995.
[3] J. O. Robinson, The Psychology of Visual Illusion. Mineola, NY: Dover, 1998.