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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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    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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    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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    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 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 investigate the sense of sight and develop and conduct their own experiments. In "CLASS EXPERIMENT," learners measure their central and peripheral visual fields...

    $10 - $20 per group Ages 8 - 18 1 to 2 hours
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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