(b Montevideo, 28 July 1874; d Montevideo, 8 Aug. 1949).
Uruguayan painter and art theorist, active mainly in Europe. In 1891 his family moved to Spain and he grew up in Barcelona, where he was part of an avant-garde circle that included the young Picasso. After a visit to New York (1920–2), he settled in France (1924–32), where he developed a severely geometrical, two-dimensional Constructivist style, and in 1929 founded the review Cercle et Carré with Michel Seuphor. In 1934 he returned to Uruguay, where he opened an art school. He wrote various works on art theory and by his example and teaching did much to promote Constructivist and Kinetic art in South America. There is a museum of his work in his native Montevideo.