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Follow the rules / 4

follow a rule, therefore, is not something that can be communicated only through descriptions. Since the descriptions should be interpreted, as well as the interpretations are, in turn, interpreted.
For this, follow a rule is a practice, and to learn how to follow a rule is needed to training.

During this training will show equal lengths, equal shapes, colors equals: and he will in turn find them and play them, and so on. The start, for example, to continue 'equally' a pattern, when it receives a certain order. - And to continue progressions, for example to continue. .. ..., Like this: .... ..... ...... The
how do you do, and he does as I do, and affect him with expressions consensus, rejection, expectation, encouragement. I let it do, or detain him, and so on.
Imagine being witness to a kind of training. No words would be defined by itself, does not it would fall under any logical circle.
During this training would also explain the terms "and so on" and "and so on ad infinitum." To do so could be used, among other things, a gesture. The gesture that means "keep going!" and "so on" has a similar function to an object or a place of the unspeakable (1).

From this point of view, the learning of theoretical content is a form of apprenticeship .
why we still need teachers.

(1) L. Wittgenstein, Philosophical Investigations , Einaudi 1983 (1953), § 208, pp. 110-111.