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    The Exploratorium
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    We don't normally view people upside down and so our brains aren't accustomed to it. However, when a portrait of a person is upside down, but some of the features on the upside down face...

    free Ages 4 - 18 Under 5 minutes
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    The Exploratorium
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    In this fun and interactive online exhibit, the straight lines of a tile wall appear to curve. The learner moves the rows of tiles and changes the color of the grout to achieve the intriguing...

    free Ages 4 - 18 5 to 10 minutes
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    The Exploratorium
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    This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict? In this Exploratorium produced activity, do you see an oval or circle...

    1 cent - $1 per student Ages 4 - adult Under 5 minutes
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    The Exploratorium
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    Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent. In this Exploratorium produced activity, you will see how you...

    1 cent - $1 per student Ages 4 - adult 5 to 10 minutes
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    The Exploratorium
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    Create an illusion where it appears that your hand has a hole in it. You'll see the results from when one eye gets conflicting information.

    1 cent - $1 per student Ages 4 - 14 Under 5 minutes