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The Spinning Disks Illusion
Johannes Zanker The Royal Holloway, University of London, UK (© 2005 Johannes M. Zanker) When sets of disks with tangential greylevel gradients are arranged in concentric circles (see image above, most...
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Dynamic Luminance-Gradient Effect
Alan Stubbs University of Maine, USA (© 2006 Alan Stubbs) For the primary effect, one should sit at a comfortable distance and then move forward toward the center of the figure. An interesting change...
View ArticleGradient-Offset Induced Motion
Po-Jang Hsieh Dartmouth College, USA (© 2006 Po-Jang Hsieh) When a gradient stimulus, whose luminance contrast ranges gradually from white on one side to black on the other, is made to disappear all at...
View ArticleSwimmers, Eels and Other Gradient-Gradient Illusions
Emily Knight & Arthur Shapiro Bucknell University, USA (© 2007 Emily Knight and Arthur Shapiro) The red button adds/removes half of the background grating. The swimmers bob up and down when they...
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