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