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Ludwig Wittgenstein is one of the most widely read philosophers of the twentieth century. But, with one exception, the books in which his philosophy was published were posthumously edited from the writings he left to posterity. This Element explores how his 20,000 pages of philosophical writing became published volumes.

This Element begins with a grammatical and phenomenological characterization of Wittgensteinian 'aspects.' It concludes by proposing that aspect perception reveals the distinction between the world as perceived and the world as objectively construed, and the role we play in the constitution of the former.

Starting from the difficulties found in historical and current debates, drawing on the background of Russell's philosophy, and grounded in the ladder structure expressed in the numbering system of the book, this Element presents the central arguments of the Tractatus.

In the interpretive literature from the 1950's through the 1970's the term 'criterion' was thought to be a central key to the understanding of Wittgenstein's later philosophy. Later on, it was relegated from this place of honour to being one of a variety of expressions used by Wittgenstein in dealing with philosophical questions. This Element tries to account for the shifting fate of this concept. It discusses the various occurrences of the word ¿criteriä in the Philosophical Investigations, argues that the post-Wittgensteinian debate about criteria was put on the wrong track by a problematic passage in Wittgenstein's early Blue Book, and finally gives an overview of the main contributions to this debate, trying to achieve a reconciliation between the rival conceptions.

Wittgenstein published next to nothing on the philosophy of religion and yet his conception of religious belief has been both enormously influential and hotly contested. In the contemporary literature, Wittgenstein has variously been labelled a fideist, a non-cognitivist and a relativist of sorts. This Element shows that all of these readings are misguided and seriously at odds, not just with what Wittgenstein says about religious belief, but with his entire later philosophy. This Element also argues that Wittgenstein presents us with an important 'third way' of understanding religious belief ¿ one that does not fall into the trap of either assimilating religious beliefs to ordinary empirical or scientific beliefs or seeking to reduce them to the expression of certain attitudes.

The question of what Wittgenstein meant by 'forms of life' has attracted a great deal of attention in the literature, yet it is an expression that Wittgenstein himself employs on only a relatively small number of occasions, and that he does not explicitly define. This Element gives a description of this concept that also explains Wittgenstein's reluctance to say much about it. A short historical introduction examines the origins and uses of the term in Wittgenstein's time. The Element then presents a survey of Wittgenstein's employment of it, and an overview of the literature. Finally, the Element offers a methodological reading of this notion, interpreting it as a conceptual tool in Wittgenstein's wider inquiries into the workings of our language.

The distinction between sense and nonsense is central to Wittgenstein's philosophy. It is at the basis of his conception of philosophy as a struggle against illusions of sense generated by misunderstandings of the logic of our language. Moreover, it informs the notions of "e;grammar"e; (in the later work) and "e;logical syntax"e; (in the early work), whose investigation serves to clear up those misunderstandings. This Element contrasts two exegetical approaches: one grounding charges of nonsensicality in a theory of sense specifying criteria that are external to the linguistic performance under indictment; and one rejecting any such theory. The former pursues the idea of a nonsensicality test; the latter holds that illusions of sense can only be overcome from within, through the very capacity of which they constitute defective exercises. The Element connects the two approaches to opposite understandings of Wittgenstein's conception of language, and defends a version of the second approach.

This Element argues that aesthetics broadly conceived plays a significant role in Wittgenstein's philosophy. In doing so, it draws on the interpretative tradition that emphasizes affinities between Wittgenstein's thought and Kant's philosophy. Following the chronology of Wittgenstein's philosophical work, this Element addresses Wittgenstein's early equation between ethics and aesthetics, his middle-period discussion on the normative character of aesthetic judgments and the possibility of their justification, and his later comparison between language and music. As a whole, it traces a continuous line of thought pertaining to a non-conceptual form of encounter with reality, which is developed in close conjunction with aesthetics and contributes to Wittgenstein's understanding of language and the method of philosophy throughout his career.