Posts for Tag: optical illusion

Optical Illusions & Visual Phenomena

My eyes, my eyes! These are just the tip of the iceberg, from the excellent site by Michael Bach -

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: and

 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:


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