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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.

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

In this activity (page 2 of PDF), learners play with a lens and a piece of paper to focus an image on the paper. Learners look at different things, and see how the lenses affect the image.

This fun hands-on astronomy activity uses a variety of simple props to help learners understand why they see what they see in a telescope.