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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 depth perception, learners create an optical illusion in a shoe box.

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 when they rotate a special black and white pattern called a Benham's Disk, it produces the illusion of colored rings.