  Finally, in 1911, Vaihinger published the first edition of PAO. The work made him something like a philosophical celebrity virtually overnight. It proved so popular that it had gone through no fewer than 10 editions by the time of his death in 1933, attracting the attention of luminaries from a wide variety of academic fields (including Einstein, Ostwald, and Freud). Halle even became informally known as the “Vaihinger-Stadt” (Vaihinger city). The PAO’s success enabled Vaihinger to found, in 1918, yet another journal, Annalen der Philosophie und philosophischen Kritik, which dealt specifically with the themes broached in the PAO, and included contributions from figures such as the mathematician Moritz Pasch, the embryologist Wilhelm Roux, and the positivist philosophers Rudolf Carnap and Hans Reichenbach. In 1930, Carnap and Reichenbach took over editorship of the Annalen and renamed it Erkenntnis. 