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CD Spinner
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In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns.
Cylindrical Mirror
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In this activity, learners create a cylindrical mirror to see themselves as others see them.
Water Sphere Lens
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In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water.
Seeing Your Retina
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In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself.
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.
Sliding Gray Step
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How can you make one shade of gray look like two? By putting it against two different color backgrounds! This activity allows learners to perform this sleight of hand very easily.