if i surround an area with a fence or a line or otherwise, the purpose may be to prevent someone from getting in or out; but it may also be part of a game and the players be supposed, say, to jump over the boundary; or it may be to shew where the property of one man ends and that of another begins; and so on. so if i draw a boundary line that is not yet to say what i am drawing it for.



ludwig wittgenstein
philosphical investigations.