Eye and optical illusions
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Lottolab illusions
Various illusions, with links to articles on the science of perception.
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Mighty optical illusions
More optical illusions.
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Optical illusions and visual phenomena
84 illusions with detailed explanations of how they work.
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Rods and cones
Information from a physics site on rods and cones structure and function
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Slow changes
Can you spot what is changing in these pictures?
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The invisible gorilla
Links from here to the famous basketball gorilla video.