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In this activity related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object.

In this activity, learners will make a thaumatrope, an old-fashioned optical illusion that dates back to the 1820s.

Make a camouflage cut-out animal! Using patterned paper or magazine pictures from around the house, use your craft skills to make a paper animal that blends into its background.

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.

This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'

This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.

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

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

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