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In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns.

In this activity, learners investigate color vision as well as plan and conduct their own experiments.

In this activity, learners explore their eye pupils and how they change.

In this activity, learners discuss and investigate how cameras, telescopes, and their own eyes use light in similar ways.

In this activity, learners conduct a simple test to find their blind spot.

In this activity, learners create a cylindrical mirror to see themselves as others see them.

In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water.

In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself.

In this activity about light and perception, learners create pictures in thin air.

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.

Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.

This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly.

In this activity, learners examine how colored lenses act like filters and absorb all colors of light except for the color of the lenses.

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

In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.

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

In this activity, learners investigate the sense of sight and develop and conduct their own experiments.

This fun and simple hands-on astronomy activity lets learners explore the difference between telescope magnification and resolution.

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