In The Logical Structure of the World (1928), Rudolf Carnap analyzes the fundamental elements of experience, the derivation of qualities, the construction of sensory classes, and the construction of the special and temporal orders. In the short essay, Pseudoproblems in Philosophy (1928), Carnap advances the view, which was to become influential in the 1930s, that in many philosophical disputes, both sides of the argument can be discarded as strictly meaningless. This is one of three books that Open Court is making available in paperback reprint in its Open Court Classics series. The other two are Carnap's Logical Syntax of Language and Schlick's Theory of Knowledge.