The sociology of art as synthesized by Arnold Hauser is based on a theory of knowledge and articulates the cognitive role of art. In a brief analysis, this paper elaborates on the sources of this epistemological enterprise. The pedigree of Hauser’s main thoughts was oriented towards a Kantian and Marxist framework, respectively. As a Kantian, he tried to take into account the philosophical consequences of two (or even more) different sources of cognition that are equal in value, correlative and necessarily (...) cooperating. Giving exclusive priority to only one of these leads to classical philosophical errors such as psychologism and intellectualism. As a Marxist, Hauser was anti-dogmatic and anti-deterministic, because he adopted an interpretive-hermeneutical meaning of Marxism and considered it an aid against distorting tendencies in our thinking. His basic insight that the different sources of value-equal and cooperating cognitive layers are in an everyday-life perspective intertwined, so that a kind of reservatio mentalis is needed to methodically separate them for the sake of better understanding, makes him a distant relative of classical phenomenology. This web of epistemological investigations is what I call the multilayer theory of knowledge. (shrink)