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CD Spinner
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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.

How Our Environment Affects Color Vision
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In this lab (Activity #1 on page), learners explore how we see color.

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