Pieter Cornelis Mondriaan was a Dutch painter and art theorist, who lived and worked abroad at a later age. Mondrian is generally seen as a pioneer of abstract and non-figurative art. His later geometric-abstract work in particular, with the characteristic horizontal and vertical black lines and primary colors, is world famous and serves as a source of inspiration for many architects and designers of applied art. He was one of the most important contributors to the magazine De Stijl and developed his own art theory, which he called new imagery or neoplasticism. He is better known abroad as Mondrian, a change he introduced himself after moving to Paris.