Two optical illusions

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Forgive my ignorance, but how do the optical illusions above work?
 

hypnagogue

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Science Advisor
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Whoa! I've seen the black dots before, but the spinning wheels are pretty trippy...
 
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Originally posted by recon
Forgive my ignorance, but how do the optical illusions above work?
Check out these sites for more illusions and explanations:

Optical Illusions: Editor Selected ResultsAbout Optical Illusions
Address:http://results.about.com/optical_illusions/ [Broken]
 
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