Basic features of postmodernism are:
- pluralism
- ambivalence
- antifundamentalism in philosophy (protest against classic rules; fundamentalism is the main feature of Cartesius’ philosophy)
The most visible feature of postmodernism is – I think – a pluralism: there are a lot of different thoughts, trends, ideas, that are existing together, even if there are discrepant. Pluralism also means that many different styles can be mixed, making a new thing.
In post-modern art there is no cult of everything what’s new, like it was in the Avant-garde (trend in art from years about 20” and 30’), there is no functionality (especially in architecture).
That art was the most popular in years about 70’ and 80’, then appeared such ideas and conceptions like neoclassicism, neoromanticism, neobaroque, trans avant-garde, etc.
Generally, in postmodernism developed a lot of different trends in arts, the most important are: pop art (A. Warhol, R. Lichtenstein), assemblage (Jean Dubuffet), conceptualism, happening (A. Kaprow), body art, fluxus, minimal art, land art, hiperrealism, video art, and many, many more.
I don’t know, how is it exactly in dance, but you may compare it to the “spirit of the epoque” ;)
(Well, I hope the post is quite clear)