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    Community Science Workshop Network
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    In this activity (posted on April 18, 2011), learners follow the steps to construct a zoetrope, a device that produces an illusion of action from a rapid succession of static pictures, using a 16...

    Over $20 per group Ages 8 - 18 1 to 2 hours
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    The Exploratorium
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    In this activity about light and perception, learners create pictures in thin air. Using a simple set up of a slide projector, slide, moveable screen or poster board, and a "wand",...

    1 cent - $1 per group Ages 8 - 14 10 to 30 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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    American Chemical Society
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    In this activity (on pages 4-5), learners make fake snow by adding water to the super-absorbant chemical from diapers, sodium polyacrylate. Different types of fake snow can be made by varying the...

    1 cent - $1 per group Ages 6 - adult 10 to 30 minutes
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    Community Science Workshop Network
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    In this activity (posted on March 27, 2011), learners follow the steps to construct a mini zoetrope, a device that produces an illusion of action from a rapid succession of static pictures. First,...

    1 cent - $1 per student Ages 6 - 18 1 to 2 hours