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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, learners construct a device that allows them to look over ledges or around corners.

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