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In this activity, learners explore light, color and rainbows by making their own rainbow glasses.

In this activity (on pages 41-47 of PDF), learners explore tesselating geometric patterns (repeated shapes, similar to the art of M.C. Escher).

This lesson (on pages 46-55 of PDF) features two strategy board games -- one from Ghana and one from China. The first game, Achi, is a cross between checkers and tic-tac-toe.

In this activity about encryption, learners cut out a secret decoder badge from a handout and use it to encode messages to each other.

Learners create an Incan counting device called a quipu (pronounced kee-poo).