Simultaneous Contrast Illusion: Koffka's Example 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                   Koffka's illusion is an example of how spatial configuration may significantly influence contrast perception. A ring of an uniform gray shade is drawn on the background of two contrasting squares. It's left and right halves acquire independent identities when the pieces are slid vertically against each other: References E. H. Adelson, Lightness Perception and Lightness Illusions Copyright © 1996-2008 Alexander Bogomolny

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