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In this optics activity, learners discover that not all shadows are black. Learners explore human color perception by using colored lights to make additive color mixtures.

In this optics activity, learners examine how polarized light can reveal stress patterns in clear plastic.

Learners use two mirrors to explore how images of images of images can repeat forever.

Make a big canvas of iridescent color with pvc pipe! In this Exploratorium Science Snack, you'll need to cut and assemble some PVC pipe, but the pay-off, the soap-bubble canvas, is big.

In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.