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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 create a cylindrical mirror to see themselves as others see them.

In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water.

In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.

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