The work of Juan Jose Saer is known for his attention on language as productive and constituent materiality. Productive, because it is mainly from the language from where we inhabit the world (El entenado). Constituent, because it is language is a material, sonorous and significant autonomy, that decentrates us from our imaginaries (El rio sin orillas). This article presents the anthropological, ideological and literary scope of the reflections proposed by Juan Jose Saer.