On the Marxist view of praxis

Praxis is the key category in Marx's practical materialism, and the cornerstone of Marxist historical materialism as well. Marx himself integrates all practical actions upon the base of existential ontology---the essence of whole society. The primary criterion of establishing a kind of aesthetics based on the Marxist practical materialism and point view of praxis as the philosophical foundation and the main point by inviting the category of praxis is whether the Marxist view of praxis has been holding firmly.