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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.

Up close, an array of dots could look random, but take a step back, and an image forms. By tracing over an image, learners can create their own dot based image.

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.

In this activity related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object.