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

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.

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.

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.