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Benham's Disk
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In this activity, learners make a Benham Top to explore visual illusions and optics.
Dark Adaptation
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In this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions.
Seeing in the Dark
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In this activity (17th on the page), learners investigate why you cannot see colors in dim light.