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

In this optics activity, learners discover that not all shadows are black. Learners explore human color perception by using colored lights to make additive color mixtures.

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

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

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

Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

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

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.