We have thoughts of the world by having thoughts of spatio-temporal positioning which, as naturalized, are mechanisms for spatio-temporal constructive output. Even thoughts of past time are such thoughts of positioning by being mechanisms for being beyond stages of temporal constructions. This allows a naturalized realist semantics in which the content of thoughts that are in the head is purported existence anywhere in space and time. A correspondence theory of truth and a truth-conditional theory of meaning derive naturalistically from this basis.