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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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    Community Science Workshop Network
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    In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see. Learners use simple materials to build a Circle Spinner, Thaumatrope, and...

    $1 - $5 per student Ages 6 - 18 30 to 45 minutes
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    The Exploratorium
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    In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair. A large Fresnel lens creates upside-down images of distant objects and right-side-up...

    $5 - $10 per student Ages 8 - 14 30 to 45 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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    WGBH
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    In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid. The activity prompts students to think about how their eyes and brain work together to make sense...

    1 cent - $1 per group Ages 6 - 11 30 to 45 minutes