Article on Duiker, covering two complete issues of Forum, November 1971 (p.1-64) and January 1972 (p.65-144).First, an introductory article (p.1-3) on the life and work of Duiker. Wiebenga is mentioned as the constructor of Zonnestraal and the Nirwânaflats, The Hague, among others. He is also seen as an influence on Duiker's knowledge of concrete construction, reference is made to patent 14321, among others. Illustrations: photographs maquette/Rijksacademie van Beeldende Kunsten Amsterdam; floor plans, facades, perspective/Rijksacademie van Beeldende Kunsten Amsterdam; photographs exterior/Nirwânaflats The Hague; floor plans, sections, facades, perspectives exterior, perspectives interior/Nirwânaflats The Hague; cover photo/High-rise flats Amsterdam; floor plans, facades, perspectives/High-rise flats Amsterdam; floor plans, facades, perspectives/United Nations General Palace Geneva; perspectives first plan/Third Craft School Scheveningen (The Hague); floor plans, situations/Resilient concrete houses for the third CIAM congress in Brussels; details (14521)/Prefab concrete system patent no. 14321; photographs exterior/Hotel and Schouwburg Gooiland Hilversum; photographs interior/Hotel and Schouwburg Gooiland Hilversum; situation/Hotel and Schouwburg Gooiland Hilversum; perspective/Hotel and Schouwburg Gooiland Hilversum; plans, sections/Hotel and Schouwburg Gooiland Hilversum