Why do you have you use so many colors in art class

When light waves strike an object and reflect back to the optic nerve in a human’s eyes, the sensation they perceive is called color. In works of art, artists use color to depict and describe the subject. Artists, especially painters, utilize their knowledge of color to portray mood, light, depth, and point of view in a work of art. Throughout history, there have been numerous iterations of color theory, which is a set of guidelines for mixing, combining, and manipulating the color spectrum.

Explanation:

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they are often in theme and variations