How to define contemporary art

Modern art, post-modern art, and contemporary art, these three words seem to constitute the general definition of the twentieth Century art. They not only have the time meaning, but also represent a relatively independent model. Br; /> <
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From the perspective of the history of art, a concept usually have two kinds of, a kind of is as a dynastic history of time category, namely modern and post modern or contemporary, they have successive time; another is as a category of the definition of art, is not the time, but to define the pattern of this art