The Belgian architect Victor Horta was among the first to introduce the whiplash curve into Art Nouveau architecture, particularly in the wrought iron stairways and complementary ceramic floors and painted walls of the Hôtel Tassel in Brussels (1892–93). The lines were was inspired by the curving stems of plants and flowers. The French architect Hector Guimard also adapted the curving lines, particularly in the gateway, stairway and interior decoration of the Castel Béranger in Paris (1894–98), and in the edicules over the entrances of the Paris Métro that he designed for the Paris Universal Exposition of 1900. Guimard also used the curving whiplash line on a large scale on the facade of the house he built for he ceramics manufacturer Coilliot in Lille (1898–1900).