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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, learners make a Benham Top to explore visual illusions and optics.

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.

In this optics activity, learners discover that when they rotate a special black and white pattern called a Benham's Disk, it produces the illusion of colored rings.