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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.

In this activity, learners examine how colored lenses act like filters and absorb all colors of light except for the color of the lenses.

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.

In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.

In this story time program, young learners listen to the Dr.

In this activity, learners will create an optical illusion top. Learners will explore color mixing, physics and design through this activity.

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.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

In this activity (3rd on the page), learners conduct a series of tests to find out which of their eyes is more dominant.

In this optics activity, learners conduct an experiment to explore peripheral vision. Learners collect data about their ability to see shapes, colors, or letters using their peripheral vision.

In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors).

In this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light.

In this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions.