Checkerboard how-to library. Cool art with math & science.

Cool optical illusions: tricky images -- See it! believe it? types of optical illusions -- Colors: frequencies of light -- Project 1: magic color spinner -- Opposite colors: take it as a complement! -- Project 2: afterimage illusions -- 3-D or not 3-D? the objects that couldn't be -- Project 3: drawing impossible objects -- Project 4: distorting illusions -- Math terms -- Glossary

Explains the different types of optical illusions and demonstrates how to create such projects as a color spinner, afterimages, and impossible objects

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530L

Decoding demand: 89 (very high) Semantic demand: 97 (very high) Syntactic demand: 65 (high) Structure demand: 77 (high)