What is Postmodernism?

Continuing to try to answer this question... This from Lyotard Jean-Francois in The Postmodern Condition: A Report on Knowledge, pg. 79

“What then, is the postmodern? What place does it or does it not occupy in the vertiginous work of the questions hurled at the rules of image and narration? It is undoubtedly a part of the modern. All that has been received, if only yesterday (modo, modo, Petronius used to say), must be suspected. What space does Cezanne challenge? The impressionists’. What object do Picasso and Braque attack? Cezanne’s. What presupposition does Dunchap break with in 1912? That which says one must make a painting, be it cubist. And Buren questions that other presupposition which he believes had survived untouched by the work of Duchamp: the place of presentation of the work. In an amazing acceleration, the generations precipitate themselves. A work can become modern only if it is first postmodern. Postmodernism thus understood is not modernism at its end but in the nascent state, and this state is constant.”