The first major work by Saarinen, in collaboration with his father, was the General Motors Technical Center in Warren, Michigan. It follows the rationalist design Miesian style: incorporating steel and glass, but with the added accent of panels in two shades of blue. The GM technical center was constructed in 1956, with Saarinen using models. These models allowed him to share his ideas with others, and gather input from other professionals. With the success of the scheme, Saarinen was then invited by other major American corporations to design their new headquarters: these included John Deere, IBM, and CBS. Despite their rationality, however, the interiors usually contained more dramatic sweeping staircases, as well as furniture designed by Saarinen, such as the Pedestal Series. In the 1950s he began to receive more commissions from American universities for campus designs and individual buildings; these include the Noyes dormitory at Vassar. Saarinen designed an ice rink, Ingalls Rink, and Ezra Stiles College at Yale University. 