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

This is a quick and simple demonstration about reflexes (second activity on the page).

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?

In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils.