Circular Poggendorff illusion

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Circular Poggendorff illusion

This is a variant of the Poggendorff's illusion. The parallel lines that obscure parts of a circle break the circle off so that its pieces do not appear to fit together.

References

R. N. Shepard, Mind Sights, W. H. Freeman and Company, 1990
A. Seckel, The Art of Optical Illusions, Carlton Books, 2000 (#38)
The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986

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