As a universal theory Luhmann's systems theory of society includes art in its ambit. The Art of Society (1995) reconstructs the formal and the social-historical conditions of the functional differentiation of a system of art since the Renaissance. The methodological focus of the reconstruction - Luhmann's theory of form (perception, first and second order observation, medium and form) and of systemic differentiation (social function, self-organization, codes and programmes, evolution and self-description of art) - are analysed in the first part of (...) the paper. The second part examines the unresolved question of the code of the art system, the hermeneutic circle integral to Luhmann's theory design, and the relation of his theory of art to the `aesthetic epoch' of art theory with special reference to Heidegger and Adorno. (shrink)