The last structure that Breuer designed (he was too ill to attend the dedication ceremony), the Atlanta Central Library was an evolution of the style and shapes used for the Whitney, a sculptural structure of cubes right angles. The airy shapes, combined with the heavy massing of concrete, led Barry Bergdoll, the chief curator of architecture at the Museum of Modern Art, to refer to this type of construction as “the invention of heavy lightness.”  Photo 11 of 12 in Design Icon: 10 Buildings by Marcel Breuer