 Members of the Frankfurt School, especially Theodor Adorno and Max Horkheimer, draw on Marx and Nietzsche to argue not just that the social world becomes “second nature” to us, but that our current social order is maintained, at least in part, by the causal effects of our treating social entities and categories as if they were natural (Adorno &amp; Horkheimer 1947, Adorno 1966). Uncovering social categories becomes a centerpiece of subsequent social criticism. If oppressive structures are to be dismantled, the social nature of the everyday world first needs to be revealed. The work of the Frankfurt School in particular is influential in contemporary feminist and race theory (see  section 5.4).