Belgian painter and sculptor. After attending the Académie des Beaux-Arts in Mons he met the poet Achille Chavée at La Louvière in 1939 and joined the Surrealist group Rupture. His first paintings were influenced by Magritte and Yves Tanguy. In 1947 he joined the Jeune Peinture Belge group in Brussels and met Christian Dotremont and Pierre Alechinsky; he was also close to the Cobra group until 1951. When he discovered the art of Alexander Calder he joined the group Art Abstrait (1952). Attracted by movement, he created the Mobile Planes (1953) and the Multiplanes (1957), which were moved by electric motors. He was also developing an aesthetic of slowness, which led in 1959 to 1961 to the Luminous Punctuations and the Erectile Punctuations. After moving to France he published La Boule et le trou (1961).

From Grove Dictionary of Art