Kanizsa Triangle 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                   Kanizsa Triangle Do you perceive edgeless triangle (square)? Does this shape appear brighter than the surrounding background? (Compare this to the Simultaneous Contrast Illusion.) The effect is known as a subjective (or illusory) contour. For a recognizable simlpe shape the brain appears to supply edges. Once edges are used elsewhere the shape becomes less prominent. References A. Seckel, The Art of Optical Illusions, Carlton Books, 2002 (#46) The Mind's Eye, Readings from SCIENTIFIC AMERICAN, W. H. Freeman and Company, 1986 Copyright © 1996-2008 Alexander Bogomolny

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