Pieter Cornelis Mondriaan, known after 1911 as Piet Mondrian, was a Dutch painter and art theoretician, who is regarded as one of the greatest artists of the 20th century. He was 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 taken down to simple geometric elements.