CINVA Experimental construction lab and wall of the experimental patio, Bogotá. April 1956Constructing the thin-shell concrete roof. June 1953.Interior with experimental house. Bogotá, Photo by Howard T. Fisher, 1954CINVA-RAM, August 1960.Experimental precast concrete stair. Photo by Howard T. Fisher, 1954.Umbrella roof, March 1956Umbrella roofs. April 1956Reinforcedconcrete cantilevered roofs on the experimental patio.