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
Hugo van der Goes seen in Florence, it was greatly praised. In his "Vite" of 1550 Giorgio Vasari referred to it as by "Ugo d'Anversa" ("Hugo of Antwerp"). This is the sole documentation for its authorship by Hugo van der Goes. All other works are attributed to van der Goes based on stylistic comparison with the altarpiece. After Hugo van der Goes' death the triptych was wrongly attributed to others, including Andrea del Castagno and Domenico Veneziano. These two artists had produced the frescoes around the altarpiece, but were not involved in its design. In 1824, Karl Friedrich Schinkel identified it as the work