Between 1955 and 1965, Paul van Hoeydonck (Belgian, b.1925) was at the very center of artistic developments in Brussels, Antwerp, Paris, Venice, Milan, Dusseldorf, and New York. He was associated with the influential ZERO group. His friends and associates included the critic Pierre Restany, and artists Piero Manzoni, Pol Bury, Yves Klein, Heinz Mack, Otto Piene, Daniel Spoerri, Jean Tinguely, and Lucio Fontana. Van Hoeydonck exhibited with the avant-garde Parisian gallerist Iris Clert, who sold his work to The Museum of Modern Art in New York. Van Hoeydonck's themes of manhood, and its interaction with the space, is central to his work. His sculpture Fallen Astronaut remains the only piece of art with a permanent place on the moon.