My eyes, my eyes! These are just the tip of the iceberg, from the excellent site by Michael Bach - http://www.michaelbach.de/ot/index.html
The Enigma
"Stare at the centre of the figure for a while. Some ‘scintillating’ activity will build up in the violet and blue annuli. Some observers also report a circular rotation within these regions; things will begin to “run around in circles”. This image “The Enigma” is by Isia Leviant (1981), Palais de la Découverte, Paris."
Rotating Snake Illusion
Source: http://www.michaelbach.de/ot/mot_rotsnake/index.html and http://www.ritsumei.ac.jp/~akitaoka/rotsnake.gif
Stereokinetic Phenomenon
"Rotation of adequate figures creates a three-dimensional illusion. It can take some time until the percept emerges. In the example on the right, envisaging a rotating crater may help. The kinetic depth effect (KDE) is a similar related phenomenon." Source: http://www.michaelbach.de/ot/mot_ske/index.html#
"In the neighbouring checkerboard you can see a central “bulge”. This bulge is illusionary: the checkerboard is fully regular and each check is square, as becomes obvious when the small ticks are not present."
Source: http://www.michaelbach.de/ot/geom_KitaokaBulge/index.html
"On the right you can see an arrangement of lozenges or elongated diamonds. Question: Where are the diamonds darker, at the top
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