During the 1950s, a ‘structural tendency’ affected international modern architecture through reinforced concrete cutting-edge geometries. In the special context of Italy, while the large reinforced concrete works of structural engineering received international attention, a deep affinity between structural and architectural conception was established in Italian architecture. In this framework, the engineer and architect Enrico Castiglioni (1914-2000) developed his architectural language featured by imaginative structures in reinforced concrete. His work, widely disseminated on the international scene through the narrative of architectural journals of the 1950s and 1960s, and today is completely forgotten. This paper presents Castiglioni’s m...