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    University of Washington
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    In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper. They use simple geometry...

    1 cent - $1 per student Ages 11 - 18 5 to 10 minutes
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    University of Washington
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    In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils. Learners hold the ends of two pencils, one in each hand at arm's-length...

    free Ages 4 - 18 Under 5 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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    University of Washington
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    In this activity, learners investigate visual perception as well as plan and conduct their own experiments. In "CLASS EXPERIMENT," learners discover how depth perception works by testing...

    1 cent - $1 per group Ages 8 - 18 1 to 2 hours
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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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    University of Washington
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    In this activity, learners investigate color vision as well as plan and conduct their own experiments. In "CLASS EXPERIMENT," learners discover that afterimages occur because of...

    $5 - $10 per group Ages 8 - 18 1 to 2 hours

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