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

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

In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision.