This paper provides arguments for and against M.Lotman’s (2002) contention that Y.Lotman’s seminal concept of semiosphere is of post-modernist (post-structuralist; Posner 2011) orientation. A comparative reading of the definitional components of the semiosphere, their hierarchical relationship and their interactions is undertaken against the two principal axes of space and subjectivity in the light of Kantian transcendental idealism, as inaugural and authoritative figure of modernity, the Foucauldian discursive turn and the Deleuzian (post) radical empiricism (sic), as representative authors of the highly versatile post-modern vernacular. This comparative reading aims at highlighting not only similarities and differences between the Lotmanian conceptualization of the semiosphere and the concerned modernist and post-modernist authors, but the construct’s operational relevance in a post-metanarratives cultural predicament that has