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Every separate sector of artistic creation has its own basic rules . . . data which govern it. They are contained in the textbooks on these subjects. A professional knows the rules of the game as a matter of course so that he can achieve, in the upper strata above that, a high quality of art.

Every separate sector of artistic creation has its own basic rules . . . data which govern it. They are contained in the textbooks on these subjects. A professional knows the rules of the game as a matter of course so