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In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.

In this activity about light and reflection, learners discover that what you see is often affected by what you expect to see.

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.

Learners use two mirrors to explore how images of images of images can repeat forever.

In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors.

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 (17th on the page), learners investigate why you cannot see colors in dim light.