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

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

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 activity (3rd on the page), learners conduct a series of tests to find out which of their eyes is more dominant.

In this story time program, young learners listen to the Dr.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.