Post-structuralism is either a continuation or a rejection of the intellectual project that preceded it—structuralism. Structuralism proposes that one may understand human culture by means of a structure—modeled on language (structural linguistics)—that differs from concrete reality and from abstract ideas—a "third order" that mediates between the two. Post-structuralist authors all present different critiques of structuralism, but common themes include the rejection of the self-sufficiency of structuralism, and an interrogation of the binary oppositions that constitute its structures. Writers whose works are often characterised as post-structuralist include: Roland Barthes, Jacques Derrida, Michel Foucault, Gilles Deleuze, Judith Butler, Jean Baudrillard, Julia Kristeva, and Jürgen Habermas, although many theorists who have been called "post-structuralist" have rejected the label.