  Adorno's idea of artistic truth content presupposes the epistemological and metaphysical claims he works out most thoroughly in Negative Dialectics. These claims, in turn, consolidate and extend the historiographic and social-theoretical arguments already canvassed. As Simon Jarvis demonstrates, Negative Dialectics tries to formulate a “philosophical materialism” that is historical and critical but not dogmatic. Alternatively, one can describe the book as a “metacritique” of idealist philosophy, especially of the philosophy of Kant and Hegel (Jarvis 1998, 148–74; O'Connor 2004). Adorno says the book aims to complete what he considered his lifelong task as a philosopher: “to use the strength of the [epistemic] subject to break through the deception [Trug] of constitutive subjectivity” (ND xx).