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Learners explore three-dimensional geometric frames including cubes and tetrahedrons, as they create bubble wands with pipe cleaners and drinking straws.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).

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

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