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Pieter Cornelis "Piet" Mondriaan, after 1912 Mondrian, (pronounced: Dutch IPA: [pi:t 'mɔndria:n], later IPA: [pi:t 'mɔndɹiɔn]), (March 7, 1872–February 1, 1944) was a Dutch painter. He was an important contributor to the De Stijl art movement and group, which was founded by Theo van Doesburg. He evolved a non-representational form which he termed Neo-Plasticism. This consisted of a grid of vertical and horizontal black lines and the use of the three primary colors.