 In an early, influential, and Wittgenstein-influenced paper, John Rawls introduced the notion of a practice as a generalization or extension of the notion of a game (Rawls 1955). The important feature of a practice for our purposes is that it introduces statuses which are internal to it. For instance, in baseball, such statuses might include being a ‘foul’, a ‘strike’, and so on; whatever what you’re doing looks like, it can’t be a (baseball) foul if you’re not playing baseball. A practice thereby introduces standards; since something is a ‘home run’ only by virtue of the fact that what is being played is baseball, there are standards, given by the rules of baseball, to which a home run has to live up. A practice also introduces reasons which are internal to it; these reasons may be means-end or calculative reasons (as when the rules specify the object of the game: in baseball, as Yogi Berra famously put it, to win, by scoring more points than the opposing team), or reasons of other kinds. (In squash, that the other player’s head is between your racquet and the ball is a reason to call a ‘let’, but not because it is the best way to win; if you were to exercise your option of hitting your opponent in the head, you would win the point. In squash, calculative reasons are modulated by gentlemanly reasons.)