One of Saarinen's earliest works to receive international acclaim is the Crow Island School in Winnetka, Illinois (1940). The first major work by Saarinen, in collaboration with his father, was the General Motors Technical Center in Warren, Michigan, which follows the rationalist design Miesian style, incorporating steel and glass but with the addition of accent of panels in two shades of blue. The GM Technical Center was constructed in 1956, with Saarinen using models, which allowed him to share his ideas with others and gather input from other professionals.