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In this trick, hold your hand over a burning candle without getting burned, by reflecting and transmitting the light of two candles. This activity is best suited as a demonstration.

In this activity, learners will make their own prism and use a glass of water to separate sunlight into different colors.

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

In this activity, learners explore why they can see colors in bubbles and why they change.

In this optics activity, learners work in pairs to explore how mirrors work. Learners use tape to mark the angles needed to see each other's reflection in a wall mirror.

Like water drops in falling rain, a CD separates white light into all the colors that make it up.

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

In "Exploring the Universe: Exoplanet Transits," participants simulate one of the methods scientists use to discover planets orbiting distant stars.

In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

In this activity about light and reflection, learners discover that what you see is often affected by what you expect to see.

Learners explore their surroundings while reasoning about categories and counting.

In this activity, learners investigate the properties of graphene and graphite.

Look at pictures through different color filters and you'll see them in a new way. People have used color filters in beautiful photography or sending secret messages.

In this simple activity, learners investigate refraction by placing a picture of an arrow behind a glass of water.

Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

In this activity about color, learners get to explore the process of chromatography. Right before their eyes, they can watch ordinary green and black ink turn into a literal rainbow of colors.

In this activity, learners explore how and why rainbows form by creating rainbows in a variety of ways using simple materials. Learners create rainbows indoors and outdoors.

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.

Learners experiment with a commercially available liquid-crystal coaster. They warm the material with their hands for varying lengths of time and observe the changing colors that result.

In this activity, learners create a colorful bookmark using a super thin layer of nail polish on water. Learners discover that a thin film creates iridescent, rainbow colors.