Streamline Moderne is an international style of Art Deco architecture and design that emerged in the 1930s. Inspired by aerodynamic design, it emphasized curving forms, long horizontal lines, and sometimes nautical elements. In industrial design, it was used in railroad locomotives, telephones, toasters, buses, appliances, and other devices to give the impression of sleekness and modernity.
In France, it was called the style paquebot, or "ocean liner style", and was influenced by the design of the luxury ocean liner SS Normandie, launched in 1932.
As the Great Depression of the 1930s progressed, Americans saw a new aspect of Art Deco, i.e., streamlining, a concept first conceived by industrial designers who stripped Art Deco design of its ornament in favor of the aerodynamic pure-line concept of motion and speed developed from scientific thinking. The cylindrical forms and long horizontal windowing in architecture may also have been influenced by constructivism, and by the New Objectivity artists, a movement connected to the German Werkbund. Examples of this style include the 1923 Mossehaus, the reconstruction of the corner of a Berlin office building in 1923 by Erich Mendelsohn and Richard Neutra. The Streamline Moderne was sometimes a reflection of austere economic times; sharp angles were replaced with simple, aerodynamic curves, and ornament was replaced with smooth concrete and glass.
The style was the first to incorporate electric light into architectural structure. In the first-class dining room of the SS Normandie, fitted out 1933–35, twelve tall pillars of Lalique glass, and 38 columns lit from within illuminated the room. The Strand Palace Hotel foyer (1930), preserved from demolition by the Victoria and Albert Museum during 1969, was one of the first uses of internally lit architectural glass, and coincidentally was the first Moderne interior preserved in a museum.
Streamline Moderne appeared most often in buildings related to transportation and movement, such as bus and train stations, airport terminals, roadside cafes, and port buildings.