Judd 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                   Judd Illusion If the middle of a segment is marked by a short evenly (with regard to the two halves) spaced rectangle or a dot, the halves appear to have different lengths depending on the direction in which the arrow heads point. The illusion disappears or at least becomes less pronounced when the marker is replaced with an arrowhead. References The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986 Copyright © 1996-2008 Alexander Bogomolny

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