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Create 3D glasses and use them to explore color, light and optics. Fool your brain into 'seeing' three dimensions on a flat surface!

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 (12th on the page), learners investigate their ability to discriminate (see) different colors.

In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

Experience a spinning spiral...you won't be hypnotized, but you'll see what happens when you look away. It's like getting off a merry-go-round and everything keeps moving.

In this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light.

In this activity (13th on the page), learners complete a simple illusion trick to see through their own hand.

In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

These two activities (4th on the page) demonstrate the importance of two eyes in judging depth.

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

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'