Poggendorff Illusion   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 Parallel lines appear to break the transversals off. The closer the inclination of the lines in the two families, the more pronounced is the effect. 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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