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Exploratorium neuroscientist Richard Brown discusses how we see color, how color vision evolved, why color vision varies from person to person, and how the scientific understanding of color vision has led to technologies such as color photography

An introduction to a spinning disc called a stroboscope, which lets you create your own animated cartoon.

A detailed demonstration of how to make a stroboscope, including a discussion of materials needed.

The science behind the Whirling Watcher stroboscope, including a discussion of the phenomenon called persistence of vision, which in this activity creates the illusion of a galloping horse.