Disco-balls light up dark rooms. As the ball spins light rays reflect off the walls and create colors. Area where the light does not his appears black because there is an absence of light. If you had multiple disco-balls spinning at one time you would be able to create more colors. When red and green lights intersected you would see green, blue and red= magenta, and blue and green would appear cyan. Each color stimulates different cones in your eyes.
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