froola Optical_illusions
An Impossible Fork at cut-the-knot
An Impossible Fork
Interactive version of the Café wall illusion (Requires Shockwave browser plugin)
Cafe Wall Illusion
Another interactive version (Requires Java-capable browser)
The Cafe Wall Illusion
Dramatic image from Purves, Lotto, and Nundy showing a much more convincing presentation of the Cornsweet illusion
Purves, Dale, R. Beau Lotto, Surajit Nundy, Why We See What We Do , American Scientist, (): (entire article)
American Scientist Online - Why We See What We Do
An interactive Fraser Spiral
Frazer's Spiral
Fraser's Spiral from MathWorld wolfram
Fraser's Spiral -- From MathWorld
Hermann Grid Illusion: Java applet with several parameters cut the knot curriculum geometry hermann
Hermann Grid Illusion
Giant grid scintillating
Scintillating Grid Illusion (spooky!)
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It uses material from the Wikipedia articles :
Anaglyph image , Animation , ASCII art , ASCII stereogram , Autokinesis , Autostereogram , Benham's top , Blivet , Café wall illusion , Craik-O'Brien-Cornsweet illusion , Fraser spiral illusion , Grid illusion , .
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Optical illusions