Book excerpt: Austere and uncompromising, the philosopher Ludwig Wittgenstein had no use for the avant-garde art works of his own time. He refused to formulate an aesthetic, declaring that one can no more define the "beautiful" than determine "what sort of coffee tastes good". And yet many of the writers of our time have understood, as academic theorists generally have not, that Wittgenstein is "their" philosopher. How do we resolve this paradox? Marjorie Perloff, our foremost critic of twentieth-century poetry, argues that Wittgenstein has provided writers with a radical new aesthetic, a key to recognizing the inescapable strangeness of ordinary language. Wittgenstein's ladder is an apt figure for this radical aesthetic, and not just in its ordinariness as an object. The movement "up" this ladder can never be more than what Wittgenstein's contemporary, Gertrude Stein, called "Beginning again and again". Wittgenstein shows us, too, that we cannot climb the same ladder twice: the use of language, the context in which words and sentences appear, defines their meaning, which changes with every repetition. Wittgenstein's aesthetic brooks no theory, no essentialism, no metalanguage - only a practice, a mode of operation, fragmentary and elliptical.