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In this optics activity, learners use paint thinner to make a small jar seem to disappear inside a larger jar.

1 cent - $1 per student Ages 8 - 14 Under 5 minutes
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In this activity, learners use a simple trick of perspective to dress friends in tiny cutout clothing. Learners make tiny pants out of card stock and tape them to the end of a stick.

1 cent - $1 per group Ages 6 - 18 5 to 10 minutes
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Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.

free Ages 4 - 18 5 to 10 minutes
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In this activity, learners investigate how geometry plays a role in perspective.

1 cent - $1 per group Ages 8 - 18 45 to 60 minutes