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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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    The Exploratorium
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    In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired. Learners will stare at a simple red shape, such as a bird,...

    $1 - $5 per student Ages 6 - 14 10 to 30 minutes
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    The Exploratorium
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    In this activity about light and perception, learners create pictures in thin air. Using a simple set up of a slide projector, slide, moveable screen or poster board, and a "wand",...

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes
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    University of Washington
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    In this activity (3rd on the page), learners conduct a series of tests to find out which of their eyes is more dominant. In other words, do they prefer to use their right or left eye to complete...

    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 related to light and perception, learners use a pinhole in an index card as a magnifying glass to help their eye focus on a nearby object. Learners will also discover that because...

    1 cent - $1 per student Ages 6 - 14 10 to 30 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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    The Exploratorium
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    This activity (aka "snack") provides instructions for discovering your blind spot. It is an exploration of light and visual perception using simple materials you may have around the house.

    1 cent - $1 per student Ages 11 - 14 10 to 30 minutes
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    Science Friday
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    In this activity, learners examine how colored lenses act like filters and absorb all colors of light except for the color of the lenses. Learners explore this phenomenon by making a cool pair of...

    $5 - $10 per student Ages 8 - 14 10 to 30 minutes
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    University of Washington
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    In this activity (16th on the page), learners play a variation of the "I Spy" game to explore color. Learners work in teams with each team assigned a color. Learners are given 10 minutes...

    1 cent - $1 per group Ages 4 - 11 10 to 30 minutes
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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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