Brecht's modernist concern with drama-as-a-medium led to his refinement of the 'epic form' of the drama (which constitutes that medium's rendering of 'autonomization' or the 'non-organic work of art'—related in kind to the strategy of divergent chapters in Joyce's novel Ulysses, to Eisenstein's evolution of a constructivist 'montage' in the cinema, and to Picasso's introduction of cubist 'collage' in the visual arts).[1] In contrast to many other avant-garde approaches, however, Brecht had no desire to destroy art as an institution; rather, he hoped to 're-function' the apparatus of theatrical production to a new social use. In this regard he was a vital participant in the aesthetic debates of his era—particularly over the 'high art/popular culture' dichotomy—vying with the likes of Adorno, Lukács, Bloch, and developing a close friendship with Benjamin. Brechtian theatre articulated popular themes and forms with avant-garde formal experimentation to create a modernist realism that stood in sharp contrast both to its psychological and socialist varieties. "Brecht's work is the most important and original in European drama since Ibsen and Strindberg," Raymond Williams argues, while Peter Bürger insists that he is "the most important materialist writer of our time."