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In this optics/mathematics activity, learners use two hinged mirrors to create a kaleidoscope that shows multiple images of an object.

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 international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

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

In this amazing activity about light and reflection, learners will use a pie plate and reflective strips from a mylar balloon to try to morph their face into a friend's.

In this hands-on botany activity, learners sprout vegetables in film canisters.

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.

In this activity, learners investigate how some butterfly wings get their color.

In this activity, learners use simple materials to create giant bubbles.

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

In this activity on page 7 of the PDF (Plants—The Green Machines), learners examine the effects that light and air have on green plants.

Align four color transparencies, each one a single color (cyan, magenta, yellow, and black), and see a beautiful full color image.

In this hands-on activity, learners build their own kaleidoscopes and explore how light can reflect of off surfaces such as mirrors, to produce beautiful patterns.

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

Create an illusion where it appears that your hand has a hole in it. You'll see the results from when one eye gets conflicting information.

In this outdoor activity, learners explore UV rays from the Sun and ways to protect against these potentially harmful rays.

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 outdoor activity, learners use only their senses to to find the extremes of several environmental variables or physical factors: wind, temperature, light, slope and moisture.

This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

If you had a long tube with a 5 millimeter wide slit, would you see the entire Golden Gate Bridge?