The dictionary describes abstract art as being art including graphic art and sculptures that do not represent recognizable objects.
In the end of the 19th century the European traditional ideas of art as beingn the imitation of nature was replaces in favor for the imagination of the unconscious mind. In the early 20th century abstract art deeloped with a group of movements like for example Expressionism and futurism. There was a group in the Netherlands whihch widened the spectrum of abstract art. It continued to grow between the two world wars and beyond 1930 it was the foremost feature of Western art. When WW2 had ended abstract expressionism came forth in U.S.A. and greatly influenced both American and European sculptures and paintings. Later on artistic output was diversed alongside conceptual and figurative art.