 After a long period in which each pursued his own interests, Deleuze and Guattari published a last collaboration in 1991, What Is Philosophy? In answering their title question, Deleuze and Guattari seek to place philosophy in relation to science and art, all three being modes of thought, with no subordination among them. Thought, in all its modes, struggles with chaos against opinion. Philosophy is the creation or construction of concepts; a concept is an intensive multiplicity, inscribed on a plane of immanence, and peopled by “conceptual personae” which operate the conceptual machinery. A conceptual persona is not a subject, for thinking is not subjective, but takes place in the relationship of territory and earth. Science creates functions on a plane of reference. Art creates “a bloc of sensation, that is to say, a compound of percepts and affects” (WP 164).