Poggendorff Illusion II

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another Poggendorff's illusion

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Copyright © 1996-2018 Alexander Bogomolny

Poggendorff illusion

A gap between the parallelogram on the left and those on the right seem to fool they into thinking which one the right is a continuation of that on the left. The effect is more pronounces when the parallelograms are thin and short and the gap between them is small. Naturally.

This is a variant of another Poggendorff's illusion.


  1. The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986

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Copyright © 1996-2018 Alexander Bogomolny