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
Jan van der Vaart Jan van der Vaart Johannes Jacobus (Jan) van der Vaart (The Hague, 17 October 1931 – Leiden, 8 November 2000) was an influential Dutch ceramist from the 20th century, known as founder of the abstract-geometric ceramics in the Netherlands. One of the key concepts in his work was the reintroduction of the pyramid or tulips tower, a specific type of tulip vase, from the 16th century in his own constructivist form. Van der Vaart is autodidact, and took a pottery class for amateurs at the Vrije Academie in The Hague by Just van Deventer and Theo Dobbelman. In the 1950s