Semiosphere is the sphere of semiosis in which sign processes operate in the set of all interconnected Umwelten. The concept was coined by Yuri Lotman in 1984 and is now applied to many fields, including cultural semiotics generally, biosemiotics, zoosemiotics, geosemiotics, etc. The concept is treated more fully in the collection of Lotman's writings published in English under the title "Universe of the Mind: A Semiotic Theory of Culture" (1990)