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

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

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