Sometimes the term "postmodernism" is used to discuss many different things ranging from architecture to historical theory to philosophy and film. Because of this fact, several people distinguish between several forms of postmodernism and thus suggest that there are three forms of postmodernism: (1) Postmodernity is understood as a historical period from the mid-1960s to the present, which is different from the (2) theoretical postmodernism, which encompasses the theories developed by thinkers such as Roland Barthes, Jacques Derrida, Michel Foucault and others. The third category is the "cultural postmodernism", which includes film, literature, visual arts, etc. that feature postmodern elements. Postmodern literature is, in this sense, part of cultural postmodernism.[8]
^Linda Hutcheon (1988) A Poetics of Postmodernism. London: Routledge, pp. 202-203.