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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 investigate parallax, a method used to measure distances to stars and planets in the solar system.

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

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 activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

In this activity, learners will explore how their own eyes work by experimenting with their photoreceptors.

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