 Finally, I have included a summary of Habermas's critique of postmodernism, representing the main lines of discussion on both sides of the Atlantic. Habermas argues that postmodernism contradicts itself through self-reference, and notes that postmodernists presuppose concepts they otherwise seek to undermine, e.g., freedom, subjectivity, or creativity. He sees in this a rhetorical application of strategies employed by the artistic avant-garde of the nineteenth and twentieth centuries, an avant-garde that is possible only because modernity separates artistic values from science and politics in the first place.  On his view, postmodernism is an illicit aestheticization of knowledge and public discourse.  Against this, Habermas seeks to rehabilitate modern reason as a system of procedural rules for achieving consensus and agreement among communicating subjects. Insofar as postmodernism introduces aesthetic playfulness and subversion into science and politics, he resists it in the name of a modernity moving toward completion rather than self-transformation.