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
Michiel van der Heijden second Dutch XCO World Champion after Bart Brentjens. He was on the start list for the 2018 Cross-country European Championship and he finished Michiel van der Heijden Michiel van der Heijden (born 3 January 1992 in Den Bosch) is a Dutch mountain biker and Cyclo Cross Rider. From 2007 until 2010 he raced for the Merida-Combee mountain bike team, now he is racing for the Rabobank cycling team. Van der Heijden won a silver medal for mountain biking in the 2009 European Championships in Zoetermeer, and a bronze medal at the Europeans in 2010 in Haifa. In 2011 he became