The skillful traveller leaves no traces of his wheels or footsteps; the skillful speaker says nothing that can be found fault with or blamed; the skilful reckoner uses no tallies; the skillful closer needs no bolts or bars, while to open what he has shut will be impossible; the skillful binder uses no strings or knots, while to unloose what he has bound will be impossible. In the same way the sage is always skillful at saving men, and so he does not cast away any man; he is always skillful at saving things, and so he does not cast away anything. This is called ‘Hiding the light of his procedure.‘
In a very interesting and thoroughly harmless essay, Scott Alexander of Slate Star Codex introduces what is to us, a very important concept. That is, the Motte-and-Bailey doctrine. Rhetoric has many tactics, some deceptive, some forthright, some effective, and some foolhardy. Properly speaking, Motte-and-Bailey is itself based on a rhetorical technique, like ‘shoot the moon’ (where you ask for something you know you won’t get in order to retreat to a position more favorable than you could ask for outright) or most forms of strategic retreat. Motte-and-Bailey however takes this idea to another level by repeatedly strategically advancing whenever it can.
To imagine this in other terms, imagine the MPAA really did want to be able to charge whenever a song anywhere was played, no matter how long, no matter the medium.