Up until his time at Yale, Rudolph's work had been a progessive exploration of modularity and functionalism. Designs produced during the 1960's began to focus more on expressive forms made of poured in place concrete, the control of light and shadow, the play with scale and composition of different types of space. The most notable difference in this work is the focus on flowing curving lines and sculptural masses, the articulation of the buildings resulting from exaggeration of the shapes of the functions within. In 1965, Rudolph moved his offices to New York and by the end of the decade focused on creating complex compositions using simple modular elements. Influenced by Moshe Safdie's prefabricated housing at the Montreal World Fair in 1967, Rudolph predicted that mass-produced mobile homes would become the basic building element in the future. Scale at the human level, the building level and the city would dominate his work during the later half of the 1960's.