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    The Exploratorium
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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. Learners will stare at a simple red shape, such as a bird,...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    The Exploratorium
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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. They will be...

    $1 - $5 per student Ages 8 - 18 30 to 45 minutes
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    The Exploratorium
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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. Learners will be surprised when two...

    $1 - $5 per group Ages 8 - 14 5 to 10 minutes
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    The Exploratorium
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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. Learners will use Benham's...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    University of Washington
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    In this activity (17th on the page), learners investigate why you cannot see colors in dim light. With five pieces of paper of different colors in front of them, learners sit in the dark for about...

    $1 - $5 per group Ages 4 - 18 5 to 10 minutes
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    The Exploratorium
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    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. Learners experiment with...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    University of Washington
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    In this activity, learners make a Benham Top to explore visual illusions and optics. This activity guide includes three different instructions for making the spinner using various recycled...

    $1 - $5 per student Ages 8 - 18 30 to 45 minutes
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    The Exploratorium
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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. This...

    $1 - $5 per student Ages 8 - 14 Under 5 minutes
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    National Health Museum
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    In this lab (Activity #1 on page), learners explore how we see color. Learners set up an experiment to evaluate how a group of learners view different colors as presented on different background...

    $1 - $5 per group Ages 8 - 18 45 to 60 minutes
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    Community Science Workshop Network
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    In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors). Use this activity to introduce learners to concepts related to optics, light,...

    $1 - $5 per student Ages 8 - 14 10 to 30 minutes

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