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Metal art

The 19th-century architectural theorist Viollet-le-Duc had advocated showing, rather than concealing the iron frameworks of modern buildings, but Art Nouveau architects Victor Horta and Hector Guimard went a step further: they added iron decoration in curves inspired by floral and vegetal forms both in the interiors and exteriors of their buildings. They took the form of stairway railings in the interior, light fixtures, and other details in the interior, and balconies and other ornaments on the exterior. These became some of the most distinctive features of Art Nouveau architecture. The use of metal decoration in vegetal forms soon also appeared in silverware, lamps, and other decorative items.

In the United States, the designer George Grant Elmslie made extremely intricate cast iron designs for the balustrades and other interior decoration of the buildings of Chicago architect Louis Sullivan.

While French and American designers used floral and vegetal forms, Joseph Maria Olbrich and the other Secession artists designed teapots and other metal objects in a more geometric and sober style.