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In this story time program, young learners listen to the Dr.

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

In this activity (16th on the page), learners play a variation of the "I Spy" game to explore color. Learners work in teams with each team assigned a color.

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

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

In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid.

Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.