Perspective Illusion from Interactive Mathematics Miscellany and Puzzles

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Perspective illusion

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Perspective Illusion

Technically speaking, this is very much the Ponzo illusion, set in a less abstract framework.

Perspective is an important feature of visual perception. Far away objects project onto smaller retinal images and are thus seen as smaller than those near by. Inversely, same size objects may appear as different if placed on a persective drawing.

References

R. N. Shepard, Mind Sights, W. H. Freeman and Company, 1990
A. Seckel, The Art of Optical Illusions, Carlton Books, 2000 (#87)
The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986

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