Since an early age, Van Hoeydonck has harboured a particular interest in the moon and outer space. He started making unpopulated planets in 1959 and went on to make Constellations, Nebulae and Stardust in different shapes and out of different materials. By firing synthetic paint onto the panel, and letting the paint create its own spontaneous chemical reactions, Van Hoeydonck wished to imitate the effect of a meteor crashing into planet. His non-brush technique ranks amongst the revolutionary ZERO techniques of the time such as slashing canvas (Fontana), punctuating (Bonalumi, Piene and Uecker) and burning (Aubertin). Van Hoeydonck's works are held by museums worldwide: The Israel Museum, Jerusalem; Museum Boymans-Van Beuningen, Rotterdam; Museum of Contemporary Art, Houston; Museum of Modern Art, New York; Smithsonian Institute, Washington DC; Solomon R. Guggenheim Museum, New York; Walraff-Richartz Museum, Cologne.