|Wikipedia: Optical Illusion|
Wikipedia: Optical Illusion – Explains what an illusion is and how it works.
Michael Bach: Optical Illusions & Visual Phenomena – 129 of them offered on this site!
Illusions.org – 100 Illusions offered.
NIH: Illusions – Explains what an illusion is and offers a few examples.
Eye Tricks: Illusions – Scroll down a bit to get to the gallery with 70 illusions. This site offers a collection of Stereograms (3D hidden images) as well.
Grand Illusions: Optical Illusions – Offers a few pages of optical illusions.
Science Kids: Illusions – Offers a variety of optical illusions.
Neuroscience for Kids: Sight (Vision) – This site offers a few explanations of how sight works and some experiments to try.
Optic 4 Kids.org: Optical Illusions: What is an Optical Illusion? – Offers some examples of illusions.
Huffington Post: 3D Optical Illusions By Kokichi Sugihara Will Make You Believe The Impossible (VIDEO)
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