Some of the best expositions appear in the theoretical writings of Jean Baudrillard, who concludes that what motivates art historical change is not any 'authentic' or 'original' impulse, but simply fashion, pivoting on the desire for novelty, which he sees as an organic and integrated processes.
The basic premise behind postmodern art is that all forms of novelty and rebellion have already been explored, and that even if that weren't true the particular emphasis on rejection of that which is old or already done is only handicapping to an artists self-expression.
Seeing as such, postmodernism is in a sense art's reconciliation of itself and its past, and postmodernists typically collect influences from all periods and schools, using several media in a given piece in a pastiche-like form.Artist Allison Hetter, when asked what postmodernism was, replied with the simple phrase: "Everything's been done already." Many observers feel that we are in the stage of post-postmodern art where: "Everything's been re-done already".