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Illusion of the week

Creepy creepy circles! (c) A. Kitaoka
Also highly recommended: Gaze at the center and approach or leave the figure, then the ring appears to rotate
intensities 1 and 2 are equal

Illusion of last week

The diamonds labelled 1 and 2 have the same brightness.

Stolen from http://www.perceptionweb.com/perc0899/editorial.html

Site last modified Sun Sep 12 15:00:21 BST 2004