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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 mind and math puzzle that requires a three-dimensional solution.

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

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.