There are few human skills where constant ‘practising’—that is, not only repetition but also more or less ‘mechanical’ repetition—is as important as in learning to play the piano. Yet we do not find anything new, such as a new fingering, through practising. Only after having discovered the new fingering by trial and error, that is, after comparing it with alternative solutions to the problem and rejecting less suitable solutions, can we begin to ‘practise’ it. Thus the function of mechanical repetition—of ‘practising’, or ‘learning by rote’—is not to discover something new, but to establish familiarity with something previously discovered. Its function is not to make us conscious of a new problem (as is the function of testing repeatedly some tentative solutions) but to eliminate as far as possible the element of consciousness from our performance. [42-3]
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