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We don't normally view people upside down and so our brains aren't accustomed to it.

In this activity about depth perception, learners create an optical illusion in a shoe box.

Which one of your eyes are dominant? Do they act independently or are they equally "in control?" This activity explores how your eyes work (or don't work) together.

This perception trick focuses on conflicting information to the brain...instead of trying to see two images, you're trying to get a bright spot by overlapping the image you see through two tubes.

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?

Known as the waterfall effect, this activity demonstrates adaptation in our visual system.

Closing one eye eliminates one of the clues that your brain uses to judge depth. Trying to perform a simple task with one eye closed demonstrates how much you rely on your depth perception.

In this online game, learners practice memory recall. They are shown a collage of pictures for two minutes, then have to write down everything they remember and check how they did.

In this fun optics activity, learners explore principles of light, reflection (mirrors), and perception. Learners work in pairs and sit on opposite sides of a "two-way" mirror.