4.463 Truth-conditions define the room to move [Spielraum – literally “play space”] left to the facts by a proposition.
(A proposition, a picture, a model, are in a negative sense like a solid body that restricts the free movement of others; in a positive sense [they are] like a space limited by solid substance wherein there is room for a body.)
Tautology leaves to reality the whole – endless – logical space; contradiction fills the whole of logical space and leaves reality not a point. Neither of them, therefore, can determine reality in any way.
Odd to say that a contradiction fills logical space, taking up every point, as if there were room for a contradiction in logical space. To say it belongs to the symbolism is, I suppose, to say just this. But in that sense tautology too is within logical space, yet Wittgenstein denies this here. So what is he saying?
Cf. Notebooks November 14th 1914.