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In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns.

$1 - $5 per student Ages 8 - 18 10 to 30 minutes
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In this activity, learners investigate color vision as well as plan and conduct their own experiments.

$5 - $10 per group Ages 8 - 18 1 to 2 hours
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In this activity, learners conduct a simple test to find their blind spot.

1 cent - $1 per student Ages 8 - 14 Under 5 minutes
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In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself.

$1 - $5 per student Ages 8 - 14 Under 5 minutes
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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.

$5 - $10 per student Ages 8 - 14 10 to 30 minutes
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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.

1 cent - $1 per student Ages 6 - 14 10 to 30 minutes
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In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

1 cent - $1 per group Ages 8 - 18 1 to 2 hours
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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.

$1 - $5 per student Ages 8 - 18 30 to 45 minutes
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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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In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.

$1 - $5 per student Ages 6 - 14 10 to 30 minutes
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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.

free Ages 6 - 18 5 to 10 minutes
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This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to simulate what it'

1 cent - $1 per group Ages 6 - adult 5 to 10 minutes
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In this story time program, young learners listen to the Dr.

Over $20 per group Ages 4 - 11 10 to 30 minutes
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In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

$1 - $5 per student Ages 4 - 14 10 to 30 minutes
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In this activity, learners conduct an experiment to test how fast they can react. Learners try to catch a piece of paper with a ruler printed on it (or a ruler) as quickly as they can.

free Ages 6 - 11 5 to 10 minutes
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In this activity (13th on the page), learners complete a simple illusion trick to see through their own hand.

1 cent - $1 per group Ages 8 - 18 Under 5 minutes
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In this optics activity, learners build an animation tool to make mini movies. When you spin a phenakistascope, the pictures move so quickly that your eyes and brain can't separate the images.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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In this activity, learners make a Benham Top to explore visual illusions and optics.

$1 - $5 per student Ages 8 - 18 30 to 45 minutes
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In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

$5 - $10 per student Ages 6 - 11 10 to 30 minutes
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In this exercise (Activity #2 on page), learners test their distance vision to evaluate their overall eyesight.

free Ages 8 - 18 5 to 10 minutes