Pieter Cornelis Mondriaan, after 1906 Piet Mondrian, was a Dutch painter and art theoretician who is regarded as one of the greatest artists of the 20th century. He is known for being one of the pioneers of 20th-century abstract art, as he changed his artistic direction from figurative painting to an increasingly abstract style until he reached a point where his artistic vocabulary was reduced to simple geometric elements.

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