History of painting group's theories. Next to van Doesburg, the group's principal members were the painters Piet Mondrian, Vilmos Huszár, and Bart van der Leck, and the architects Gerrit Rietveld, Robert van 't Hoff, and J. J. P. Oud. The artistic philosophy that formed a basis for the group's work is known as "neoplasticism" — the new plastic art (or "Nieuwe Beelding" in Dutch). Proponents of De Stijl sought to express a new utopian ideal of spiritual harmony and order. They advocated pure abstraction and universality by a reduction to the essentials of form and colour; they simplified visual compositions to the vertical
Piet Van Waeyenberge Foundation). He has been honored as a "Commandeur in de Orde van Oranje-Nassau" (Dutch) and "Officier in de Leopoldsorde" (Belgian). Piet Van Waeyenberge Piet Paul August, Baron Van Waeyenberge (born Ghent 27 October 1938) is a Belgian businessman. He is a son of Camille Van Waeyenberge and a brother of Jozef Van Waeyenberge. He was one of the founders, and is currently president, of business club De Warande. He is married to Wina Proesmans and together they have 3 children. He graduated in 1956 from high school at the Sint-Jan Berchmanscollege in Brussels and obtained a licentate in Commercial and