 Originally, there were two commonly recognized stages of Wittgenstein’s thought—the early and the later—both of which were taken to be pivotal in their respective periods. In this orthodox two-stage interpretation, it is commonly acknowledged that the early Wittgenstein is epitomized in his Tractatus Logico-Philosophicus. By showing the application of modern logic to metaphysics, via language, he provided new insights into the relations between world, thought, and language and thereby into the nature of philosophy. It is the later Wittgenstein, mostly recognized in the Philosophical Investigations, who took the more revolutionary step in critiquing all of traditional philosophy including its climax in his own early work. The nature of his new philosophy is heralded as anti-systematic through and through, yet still conducive to genuine philosophical understanding of traditional problems. In more recent scholarship, this division has been questioned: some interpreters have claimed a certain unity between all stages of his thought, while others talk of a more nuanced division, adding stages such as the middle Wittgenstein and the post-later Wittgenstein.