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    The Exploratorium
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    In this activity, learners make a stroboscope--a spinning disk with slits around the edge that you look through. Brief but frequent glimpses of images seen through the slits lead to a surprising...

    1 cent - $1 per student Ages 8 - 14 10 to 30 minutes
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    The Exploratorium
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    In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns. Learners will use Benham's...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    New York Hall of Science
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    Design and create an optical illusion toy that makes two pictures appear to become one. This is called a thaumatrope and will allow the learner to investigate the phenomenon of persistence of...

    $1 - $5 per student Ages 6 - 11 10 to 30 minutes
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    The Tech Interactive
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    In this activity, learners will make a thaumatrope, an old-fashioned optical illusion that dates back to the 1820s. The two images on either side of a cardstock circle will appear to merge when...

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