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

In this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light.

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.

This activity (aka "snack") provides instructions for discovering your blind spot. It is an exploration of light and visual perception using simple materials you may have around the house.