Metafiction
Metafiction is essentially writing about writing or "foregrounding the apparatus", as it's typical of deconstructionist approaches, making the artificiality of art or the fictionality of fiction apparent to the reader and generally disregards the necessity for "willful suspension of disbelief". For example, postmodern sensibility and metafiction dictate that works of parody should parody the idea of parody itself.
Metafiction is often employed to undermine the authority of the author, for unexpected narrative shifts, to advance a story in a unique way, for emotional distance, or to comment on the act of storytelling. For example, Italo Calvino's 1979 novel If on a winter's night a traveler is about a reader attempting to read a novel of the same name. Kurt Vonnegut also commonly used this technique: the first chapter of his 1969 novel Slaughterhouse-Five is about the process of writing the novel and calls attention to his own presence throughout the novel. Though much of the novel has to do with Vonnegut's own experiences during the firebombing of Dresden, Vonnegut continually points out the artificiality of the central narrative arc which contains obviously fictional elements such as aliens and time travel. Similarly, Tim O'Brien's 1990 novel/story collection The Things They Carried, about one platoon's experiences during the Vietnam War, features a character named Tim O'Brien; though O'Brien was a Vietnam veteran, the book is a work of fiction and O'Brien calls into question the fictionality of the characters and incidents throughout the book. One story in the book, "How to Tell a True War Story", questions the nature of telling stories. Factual retellings of war stories, the narrator says, would be unbelievable and heroic, moral war stories don't capture the truth.
Read more about this topic: Postmodern Literature, Common Themes and Techniques