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In this activity, learners construct a device that allows them to view 2-D images in 3-D.

In this activity (posted on March 14, 2011), learners follow the steps to construct a camera projector to explore lenses and refraction.

In this activity, learners explore the many uses of periscopes and how this simple device was designed and is used in many applications.

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.