http://web.mit.edu/persci/gaz/gaz-teaching/flash/contrast-movie.swf
You can find this image at http://www.colorcube.com/illusions/scstripe.htm. What is the sort of impression that you get from it?... I mean: pay special attention to red squares.
Try this too. It is about the same perceptual effect:
http://www.cut-the-knot.org/Curriculum/Geometry/Contrast.shtml
http://www.educacionplastica.net/ContrasteSimultaneo.html
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