 Drawings recently made public by the Museum of Modern Art indicate that the architect provided ceiling details that allow for the addition of curtain tracks that would allow privacy separations of the open spaces into three "rooms".Mies applied this space concept, with variations, to his later buildings, most notably at Crown Hall, his Illinois Institute of Technology campus masterpiece.The notion of a single room that can be freely used or zoned in any way, with flexibility to accommodate changing uses, free of interior supports, enclosed in glass and supported by a minimum of structural framing located at the exterior, is the architectural ideal that defines Mies' American career.