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    WGBH
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    In this activity, learners investigate how geometry plays a role in perspective. The lesson begins with a demonstration, in which learners of the same height stand side by side near the end of a...

    1 cent - $1 per group Ages 8 - 18 45 to 60 minutes
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    The Exploratorium
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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. Then, learners...

    1 cent - $1 per group Ages 6 - 18 5 to 10 minutes
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    The Exploratorium
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    In this activity, a lightbulb is placed in front of a concave mirror. The actual lightbulb is not visible to the viewer, but the viewer can see the mirror image of the lightbulb formed in space....

    Over $20 per group Ages 8 - 14 30 to 45 minutes
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    The Exploratorium
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    This online exhibit is a visual illusion in which a fuzzy blue dot disappears into a green background. The illusion is created by the tiny jittering movements that your eyes are continually making....

    free Ages 6 - 14 5 to 10 minutes
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    University of Washington
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    In this activity related to the famous "Stroop Effect," learners explore how words influence what we see and how the brain handles "mixed messages." Learners read colored words...

    free Ages 8 - 18 10 to 30 minutes
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    The Exploratorium
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    In this activity about light and reflection, learners use a special device called a Mirage Maker™ to create an illusion. What they perceive as an object is really an image in space, created by two...

    Over $20 per student Ages 8 - 14 5 to 10 minutes
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    Optical Society of America
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    In this optics activity, learners use water to make a coin "appear" and "disappear." Use this activity to demonstrate how light refracts and introduce light as waves. This...

    1 cent - $1 per student Ages 6 - 11 Under 5 minutes
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    Optical Society of America
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    In this optics activity, learners use paint thinner to make a small jar seem to disappear inside a larger jar. Use this activity to demonstrate the role of indexes of refraction in our ability to...

    1 cent - $1 per student Ages 8 - 14 Under 5 minutes
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    Science Museum of Minnesota
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    This activity is a fun way to show two stages in a Monarch butterfly's life cycle. Learners will create an optical illusion that can be flipped from caterpillar to butterfly. This is an...

    1 cent - $1 per student Ages 4 - 8 10 to 30 minutes
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    The Exploratorium
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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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