An American style that’s closely related to and usually mixed with Art Deco Style. Both are made possible by the Machine Age and both use metals in polished workmanship. Key difference: vertical lines for Art Deco vs horizontals for Art Moderne. Art Moderne is additionally inspired by aerodynamic design and uses “speed lines” in regular intervals.. Architecture, doors, windows and furniture pieces are finished with clean, curved corners. These features are used in related retro Diner Style.