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

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

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 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 make a Benham Top to explore visual illusions and optics.

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