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In this activity about light and perception, learners create pictures in thin air.

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

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

In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary.