Seagram Building on Park Avenue, New York, 1954-1958, designed by Mies van der Rohe in collaboration with Philip Johnson.
I love how simple and effective this model is at showing how space can be loosely framed by material. Mies for the win.
Seagram Building - Mies van der Rohe - © Hagen Stier
Mies van der Rohe Seagram building 1958- interior: the lobby
Mies van der Rohe, 860–880 Lake Shore Drive Apartment Buildings, Chicago, 1948–51; under construction, 1950–1.