In this article written for general readership in the popular American monthly, Harper’s Magazine, Boyd repeats observations he’d made a year earlier in ‘Engineering of Excitement’ (1958) for his architect-readers. Again, the work of Finnish American architect Eero Saarinen is highlighted as signalling what Boyd sees as a shift by many architects around the world to designing daring ‘shape’ architecture from the mid to late 1950s. Boyd describes Saarinen as one of the key leaders of this ‘second generation modern’, and that buildings like the David S. Ingalls Hockey Rink at Yale University (1953-58) and TWA Terminal (1955-62) show him moving from “reasoned rectangles to felt space”. Jørn Utzon’s Sydney Opera House (1957-66) is also included in this global trend. For Boyd, these explorations of hyperbolic paraboloid forms, tensile structures and curved concrete shells, what Boyd describes as “The Saarinen trail”, lead “to the fundamental question of the nature of architectural expression” (pdf)