Mathematics and art through the strings as with a bird cage and to see one form within another which excited me." The artists Theo van Doesburg and Piet Mondrian founded the De Stijl movement, which they wanted to "establish a visual vocabulary elementary geometrical forms comprehensible by all and adaptable to any discipline". Many of their artworks visibly consist of ruled squares and triangles, sometimes also with circles. De Stijl artists worked in painting, furniture, interior design and architecture. After the breakup of De Stijl, Van Doesburg founded the Avant-garde Art Concret movement, describing his 1929–1930 "Arithmetic Composition", a series of four black
Bart van Leeuwen and portraits. Andy Warhol, Bob Geldof, Candy Dulfer, Carice van Houten, Dizzy Gillespie, Dolores Olmedo, Freddie Mercury, Giorgio Armani, Grace Jones, Herman Brood, Jean-Michel Basquiat, Jerry Hall, John Cale, Nina Hagen and Sylvia Kristel are among the celebrities he photographed. Some of Van Leeuwen's published work includes: Van Leeuwen's exhibitions include: Bart van Leeuwen Bart van Leeuwen (Amsterdam, 5 February 1950 — June 2017) was a Dutch photographer and author. He published his first pictures in 1967, graduated from the School for Professional Photography in The Hague in 1969 and started to work as a freelance photographer in 1971. Inspired