One of the chief concerns of Marxist aesthetics is to unite Marx and Engels’ social and economic theory, or theory of the social base, to the domain of art and culture, the superstructure. These two terms, base and superstructure, became an important dichotomy in The German Ideology (1846), which however was not published during their lifetimes. Likewise Marx's early Economic and Philosophical Manuscripts of 1844, which, though widely regarded as important for treating the themes of sensuousness and alienation, first appeared only in 1932 (the slated 1846 publication was canceled) and in English only in 1959.[1][2] The manuscripts were therefore unknown to art theorists during, for instance, the often antagonistic debates on art in the early Soviet Union between the constructivist avant garde and the proponents of socialist realism.