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In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns.

In this activity about light and perception, learners create and observe moire patterns.

In this activity, learners explore how mirrors reflect light and change the way we see things.

Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

In this lab (Activity #1 on page), learners explore how we see color.

In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).