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In this activity about light and perception, learners create pictures in thin air.

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

In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye.

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