of humans, makes possible the further dimension of cultural organization within the otherwise merely social organization of non-human animals whose powers of observation may deal only with directly sensible instances of objectivity. This further point, that human culture depends upon language understood first of all not as communication, but as the biologically underdetermined aspect or feature of the human animal's "Innenwelt", was originally clearly identified by Thomas A. Sebeok.<ref>Sebeok, Thomas A. 1986. "Communication, Language, and Speech. Evolutionary Considerations." Pp. 10–16 in I Think I Am A Verb. More Contributions to the Doctrine of Signs. New York: Plenum Press. Published lecture. Original lecture title "The Evolution of Communication and the Origin of Language," in International Summer Institute for Semiotic and Structural Studies Colloquium on 'Phylogeny and Ontogeny of Communication Systems (June 1–3, 1984).</ref> Sebeok also played the central role in bringing Peirce's work to the center of the semiotic stage in the twentieth century, first with his expansion of the human use of signs ("anthroposemiosis") to include also the generically animal sign-usage ("zoösemiosis"), then with his further expansion of semiosis to include the vegetative world ("phytosemiosis"). Such would initially be based on the work of Martin Krampen, but takes advantage of Peirce's point that an interpretant, as the third item within a sign relation, "need not be mental."Peirce, Charles Sanders. 1977 [1908]. "letter to Lady Welby 23 December 1908" [letter]. Pp. 73–86 in Semiotic and Significs: The Correspondence between C. S. Peirce and Victoria Lady Welby, edited by C. S. Hardwick and J. Cook. Bloomington, IN: Indiana University Press. Peirce distinguished between the interpretant and the interpreter. The interpretant is the internal, mental representation that mediates between the object and its sign. The interpreter is the human who is creating the interpretant. Peirce's "interpretant" notion opened the way to understanding an action of signs beyond the realm of animal life (study of "phytosemiosis" + "zoösemiosis" + "anthroposemiosis" = biosemiotics), which was his first advance beyond Latin Age semiotics. Other early theorists in the field of semiotics include Charles W. Morris. Writing in 1951, Jozef Maria Bochenski surveyed the field in this way: "Closely related to mathematical logic is the so-called semiotics (Charles Morris) which is now commonly employed by mathematical logicians. Semiotics is the theory of symbols and falls in three parts, (1) logical syntax, the theory of the mutual relations of symbols, (2) logical semantics, the theory of the relations