The World and Language propounds the assumption that natural language is not linear. Linear languages are those in which an iteration of a sign is allowed. In contrast, in natural language--as it is assumed--an iteration of a term must have a different meaning than the initial term. Cogency of the notion of non-linearity is deemed to grow as its explanatory power is being revealed, though the idea of non-linearity itself does not seem to be contrary to common sense from the very beginning. Among the issues discussed in this book are the following: paradoxes; the concept of number; realism (as it should be understood within the concept); falsifiability, a peculiar aspect of the mind-body problem; universals; and other issues.