The discovery of the communicative world. Studies on comparative media history Media and forms of communication of various cultures are compared in synchronic and diachronic perspective. Giesecke starts with the generation of knowledge, networks, and the ideal of communication in Plinius Secundus" Natural history. This is followed by the controlling of communicative networks in the Middle Ages, functions of speech, manuscripts and print as the media of city and court, graphic and typographic media as a factor of development in the history of language and notions, written language as a technological system (together with Georg Elwert), alphabetization and emancipation (together with Georg Elwert), advantages and disadvantages of typographic monoculture, triadic media- and information theories and the co-evolution of the media and the senses, principles and methods of a comparative historiography of cultural communication, the promotion and hierarchization of information as the motor of cultural history, and finally a culture-comparative of graphic communication media in Japan and Germany (together with Shiro Yukawa). In the conclusive chapter Giesecke searches for post-typographic ideals of education.