  This also shows that contemporary naturalism is different from the latter Wittgenstein's superficially similar metaphilosophy. Wittgenstein's anti-philosophy, like naturalism, bars philosophy from changing mathematics: “Philosophy may in no way interfere with the actual use of language…It leaves everything as it is. It also leaves mathematics as it is” (1953, §163). Naturalism's revolutionary tenor, however, means that it does not leave everything as it is.