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|A "site for the enquiring mind, with optical illusions, scientific toys, visual effects, and even a little magic." Includes a number of feature articles on vision, photography, mirrors, optical toys, movies, etc. See, in particular, the geometrical optical illusion, also known as the "hole in the triangle" bamboozlement puzzle; and the Monty Hall problem (includes a simulation).|
|Levels:||Middle School (6-8), High School (9-12), College|
|Resource Types:||Graphics, Recreations|
|Math Topics:||Euclidean Plane Geometry, Triangles and Other Polygons|
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