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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 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