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In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision.

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 (26th on the page), learners construct an easy-to-build device and test motor learning.

In this activity, learners make a Benham Top to explore visual illusions and optics.