Post modernism has changed so profoundly that the term applies to nearly everything, even the paintings

Postmodernism has now become a historicist, period term for the era beginning with the sixties and ending somewhere around the fall of the Berlin wall.

W. J. T. Mitchell

Postmodernism

Using the term "postmodern art" or "postmodernism" to mean a rejection of 20th century rationalism ("So what" is another definition of the "post painting" era).