The goals of an activity are not always as clear as those of tennis, and the feedback is often more ambiguous than the simple “I am not falling” information processed by the climber. A composer of music, for instance, may know that he wishes to write a song, or a flute concerto, but other than that, his goals are usually quite vague. And how does he know whether the notes he is writing down are “right” or “wrong”? The same situation holds true for the artist painting a picture, and for all activities that are creative or open-ended in nature. But these are all exceptions that prove the rule:
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