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    The Exploratorium
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    This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match. Although this is a perception activity, it also...

    free Ages 6 - 18 5 to 10 minutes
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    University of Washington
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    In this activity (12th on the page), learners investigate their ability to discriminate (see) different colors. Learners arrange jars, each filled with water and different amounts of food coloring,...

    1 cent - $1 per group Ages 8 - 18 5 to 10 minutes
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    University of Washington
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    In this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions. Learners sort similar bottle caps in a well-lit...

    free Ages 8 - 18 10 to 30 minutes
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    University of Washington
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    In this activity (13th on the page), learners complete a simple illusion trick to see through their own hand. Learners roll up a piece of notebook paper into a tube, arrange their hands in a...

    1 cent - $1 per group Ages 8 - 18 Under 5 minutes
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    New York Hall of Science
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    Create 3D glasses and use them to explore color, light and optics. Fool your brain into 'seeing' three dimensions on a flat surface!

    1 cent - $1 per student Ages 6 - 18 10 to 30 minutes
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    The Exploratorium
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    Are there boxes, is this an illusion, or is this real life Q-bert? Illusions are always fun to build especially when you can build them. Close one eye after making a Far-Out Corner and the "...

    1 cent - $1 per student Ages 6 - 18 5 to 10 minutes
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    Community Science Workshop Network
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    In this activity (posted on March 20, 2011), learners follow the steps to construct a stroboscope, a device that exploits the persistence of vision to make moving objects appear slow or stationary....

    $5 - $10 per student Ages 8 - 18 1 to 2 hours
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    The Exploratorium
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    In this activity about light and perception, learners discover how a flash of light can create a lingering image called an "afterimage" on the retina of the eye. Learners will be...

    1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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    The Exploratorium
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    How can you make one shade of gray look like two? By putting it against two different color backgrounds! This activity allows learners to perform this sleight of hand very easily. They will be...

    $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 (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light. Learners can draw their own blind spot testers, use the provided...

    1 cent - $1 per group Ages 8 - 18 10 to 30 minutes

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