'Tractatus Logico-Philosophicus' may be the most important book of philosophy written during the twentieth century. Wittgenstein's writing style is clear, succinct, and accessible. Bertrand Russell claimed that, "e;I cannot see any point on which it is wrong. But to have constructed a theory of logic which is not at any point obviously wrong is to have achieved a work of extraordinary difficulty and importance."e; Required reading for anyone interested in philosophy.