Poggendorff Illusion II This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at http://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet. Buy this applet A few words Copyright © 1996-2008 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. References The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986 Copyright © 1996-2008 Alexander Bogomolny

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