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In this activity about light and perception, learners create and observe moire patterns.

In this optics activity, learners make a lens and explore how the eye manipulates the light that enters it.

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, learners make a Benham Top to explore visual illusions and optics.

In this activity, learners control the (apparent) size of a hole with their brain.

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.