How is tim o’brien’s chapter “good form” an example of postmodernism?

Tim O'Brien's "Good Form" chapter is an example of postmodernism because the chapter makes references to itself. This is a strong characteristic of postmodernist literature.

Explanation:

Postmodernism, Post-Modernity, is a contemporary process of significant changes in artistic, philosophical, sociological, and scientific trends. It emerged after World War II (1939-1945) and the Modernist movement.  The postmodern literature is the literature characterized by the dependence of narrative techniques, such as fragmentation, paradox and unreliable narrator; and is often (though not exclusively) defined as a style or trend that emerged in the post-World War II era. Postmodern works are seen as a response to the dogmatic following of Enlightenment thought and modernist approaches to literature. Tim O'Brien is an example of an author who adopted the characteristics of the postmodernist movement in his works.

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not concrete, existing in thought or as an idea but not having a physical or concrete existence