"All I know is that I know nothing":
http://www.sciam.com/article.cfm?id=the-neuroscience-of-illusion
Colors:
http://www.joe-ks.com/archives_aug2006/RotatingIllusion.htm
Left brain? Right brain? Visual ambiguity:
http://www.news.com.au/perthnow/story/0,21598,22492511-5005375,00.html
(Thanks to Taylor and Lia for the first two links).
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