

At 68 Prinz-Eugen-Straße in Vienna’s 4th district lived Moritz Schlick, the leading figure of the Vienna Circle. From the summer of 1927 onwards, regular meetings took place between Schlick, Ludwig Wittgenstein, and selected members of the Circle. It soon became clear, however, that Wittgenstein was by no means the positivist he had initially been taken to be (Monk, 1991, p. 243).