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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 investigate visual perception as well as plan and conduct their own experiments.

In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

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.

In this demonstration, learners investigate mass, gravity, and acceleration by dropping a wooden bar with a balloon attached to its underside, a mass suspended from it by rubber bands, and a sharp-poi

In this activity, learners will make a thaumatrope, an old-fashioned optical illusion that dates back to the 1820s.