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    Community Science Workshop Network
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    In this activity, learners construct a device that allows them to view 2-D images in 3-D. These 2-D stereoscopic images are simply pictures of the same thing, taken from two positions some distance...

    Over $20 per student Ages 6 - 11 1 to 2 hours
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    WGBH
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    In this activity, learners make an optical illusion toy from the 1800s to explore persistence of vision. When you spin the Thaumatrope, the pictures move so quickly that your eyes and brain can&...

    $1 - $5 per student Ages 6 - 11 5 to 10 minutes
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    WGBH
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    In this optics activity, learners build a spy tool to secretly view things over walls or around corners. Learners discover that the mirrors inside the periscope reflect light to help you see what&...

    $5 - $10 per student Ages 6 - 11 10 to 30 minutes
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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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    Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them. Close one eye after making a Far-Out Corner and the "...

    1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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    Community Science Workshop Network
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    In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary....

    $5 - $10 per student Ages 8 - 18 1 to 2 hours
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    Science Friday
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    In this activity, learners discuss and investigate how cameras, telescopes, and their own eyes use light in similar ways. By building their own pinhole viewers, learners make observations about the...

    1 cent - $1 per student Ages 11 - 14 45 to 60 minutes
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    The Exploratorium
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    In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye. Learners will be...

    1 cent - $1 per student Ages 8 - 18 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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    WGBH
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    In this optics activity, learners build an animation tool to make mini movies. When you spin a phenakistascope, the pictures move so quickly that your eyes and brain can't separate the images....

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes

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