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CD Spinner
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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.

Rotating Light
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In this activity, learners explore what happens when polarized white light passes through a sugar solution.

Touch the Spring (Lightbulb)
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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.

Our Sense of Sight: Color Vision
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In this activity, learners investigate color vision as well as plan and conduct their own experiments.

Spherical Reflections
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In this art meets science activity, learners pack silver, ball-shaped ornaments in a single layer in a box to create an array of spherical reflectors.

Blind Spot
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In this activity, learners conduct a simple test to find their blind spot.

Water Sphere Lens
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In this activity about light and refraction, learners make a lens and magnifying glass by filling a bowl with water.

Seeing Your Retina
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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.

Diffraction
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In this optics activity, demonstrate diffraction using a candle or a small bright flashlight bulb and a slide made with two pencils.

Parabolas: It's All Done with Mirrors
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In this activity about light and reflection, learners use a special device called a Mirage Maker™ to create an illusion.

Pinhole Magnifier
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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.

Tiny Pants Photo Challenge
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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.

Fading Dot
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In this activity, learners play with a fuzzy-colored dot that has no distinct edges seems to disappear. As learners stare at the dot, its color appears to blend with the colors surrounding it.

Experiencing Parallax With Your Thumb
Source Institutions
In this activity, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

Our Sense of Sight: How We Perceive Movement, Depth and Illusions
Source Institutions
In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

Spinning Illusions
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In this activity, learners construct three optical illusion toys to examine how our brains play tricks on what we see.

Moiré Patterns
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In this activity about light and perception, learners create and observe moire patterns.

Color Vision
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In this online activity, learners make a whole rainbow by mixing red, green, and blue light. They can change the wavelength of a monochromatic beam or they can filter white light.

Stroboscope
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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.
Multiple Reflections
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In this activity, learners explore how mirrors reflect light and change the way we see things.