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In this activity (16th on the page), learners play a variation of the "I Spy" game to explore color. Learners work in teams with each team assigned a color.

In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.

In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.