Yes, try this in Photoshop. Select the two squares with magic wand. Then invert the selection, then delete the background. Voila! Instant magic. (Undo a few times for best effect) The actual illusion is here:Checkershadow Illusion <www-bcs.mit.edu> Also, this guy has made a bunch of Flash illusions which work on similar principles; the eyes and the mind- friends forever. Lightness Demonstrations <www-bcs.mit.edu>
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