Optical illusions: caused by eye or brain?

When viewing the famous optical illusion painting Enigma by Isia Leviant, many people claim to see motion within the colored circles moving against the black and white striped background. Although this optical illusion has been known for a long time, its physiological origins are still unknown.

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<p><a href="http://www.physorg.com/news145621013.html">Optical illusions: caused by eye or brain?</a></p> <p>When viewing the famous optical illusion painting <i>Enigma</i> by Isia Leviant, many people claim to see motion within the colored circles moving against the black and white striped background. Although this optical illusion has been known for a long time, its physiological origins are still unknown.</p>