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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.

Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them.

In this activity, learners construct a device that allows them to view 2-D images in 3-D.

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.

In this optics/mathematics activity, learners use two hinged mirrors to create a kaleidoscope that shows multiple images of an object.

In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.

In this activity, learners play with a fuzzy-colored dot that has no distinct edges seems to disappear. As learners stare at the dot, its color appears to blend with the colors surrounding it.

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

This fun and simple hands-on astronomy activity lets learners explore the difference between telescope magnification and resolution.

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

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

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

In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

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.

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.

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 artistic activity, learners blow up a smaller picture into a larger one, by using a grid.