Commodity fetishism is theoretically central to the Frankfurt School philosophy, especially in the work of the sociologist Theodor W. Adorno, which describes "how" the forms of commerce invade the human psyche; how commerce casts a person into a role not of his or her making; and how commercial forces affect the development of the psyche. In the book "Dialectic of Enlightenment" (1944), Adorno and Max Horkheimer presented the Theory of the Culture Industry to describe how the human imagination (artistic, spiritual, intellectual activity) becomes commodified when subordinated to the "natural commercial laws" of the market.