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.
The arts generally have had to recognize Modernism - how should poetry escape?
Modernism released us from the constraints of everything that had gone before with a euphoric sense of freedom.
French design hardly exists except as artificial modernism.
Without this spirit Modernist architecture cannot fully exist. Since there is often a mismatch between the logic and the spirit of Modernism I use architecture to reconcile the two.
Post-Modernism was a reaction against Modernism. It came quite early to music and literature and a little later to architecture. And I think it's still coming to computer science.
Postmodernism surely requires an even greater grasp of symbolism as it's increasingly an art of gesture alone.