(as opposed to mass and solidity), regularity, and flexibility. Hitchcock and Johnson identified three principles: the expression of volume rather than mass, the emphasis on balance rather than preconceived symmetry, and the expulsion of applied ornament. Common characteristics of the International Style include: a radical simplification of form, a rejection of ornament, and adoption of glass, steel and concrete as preferred materials. Further, the transparency of buildings, construction (called the honest expression of structure), and acceptance of industrialized mass-production techniques contributed to the international style's design philosophy. Finally, the machine aesthetic, and logical design decisions leading to support building function were used by the International architect to create buildings reaching beyond historicism. The ideals of the style are commonly summed up in three slogans: ornament is a crime, truth to materials, form follows function; and Le Corbusier's description: "A house is a machine to live in". The following architects and buildings were selected by Hitchcock and Johnson for display at the exhibition Modern Architecture: International Exhibition: Notable omissions The exhibition excluded other contemporary styles that were exploring the boundaries of architecture at the time, including: Art Deco; German Expressionism, for instance the works of Hermann Finsterlin; and the organicist movement, popularized in the work of Antoni Gaudí. As a result of the 1932 exhibition, the principles of the International Style were endorsed, while other styles were classed less significant. In 1922, the competition for the Tribune Tower and its famous second-place entry by Eliel Saarinen gave some indication of what was to come, though these works would not have been accepted by Hitchcock and Johnson as representing the "International Style". Similarly, Johnson, writing about Joseph Urban's recently completed New School for Social Research in New York, stated: "In the New School we have an anomaly of a building supposed to be in a style of architecture based on the development of the plan from function and facade from plan but which is a formally and pretentiously conceived as a Renaissance palace. Urban's admiration for the New Style is more complete than his understanding." California architect Rudolph Schindler's work was not a part of the exhibit, though Schindler had pleaded with Hitchcock and Johnson to be included. Then, "[f]or more than 20 years, Schindler had intermittently launched a series of spirited, cantankerous exchanges with the museum." Before 1932 1932–1944 The gradual rise of the Nazi regime in Weimar Germany in the