ILLUSIONS

http://www.michaelbach.de/ot/
Gives a detailed description of how each illusion works (but some of the examples are a bit subtle so you might not get the full effect).

http://www.nobeliefs.com/puzzles/illusions.htm
Some of the more common illusions are featured here (I recommend the Colour-Word exercise if you haven't seen it before).

http://www.colorcube.com/illusions/illusion.htm
Divided into categories based on the type of effect created.

That should amuse the illusion fans for a little while ;)
 
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