Final answer:
The principles of design in art include proportion, emphasis, and color, but not rhythm.
Step-by-step explanation:
All of the principles of design in art mentioned in the options are valid except for rhythm. Proportion, emphasis, and color are key principles in art. Proportion refers to the size relationships of different elements in a composition, emphasis involves creating a focal point or highlighting certain elements, and color plays a crucial role in conveying mood, symbolism, and visual interest. Rhythm, on the other hand, pertains to the repetition or movement of elements, which is a principle in music rather than visual art.
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