Group exhibition with Karel Appel, Armando, Gerrit Benner, Kees van Bohemen, Bram Bogart, Constant Nieuwenhuys, Jeun Dubuffet, Alphons Freijmuth, Jaap Hillenius, Willem de Kooning, Shinkichi Tajiri, Ronald Tolman, Bram van Velde and Theo Wolvecamp