 Complete the following phrase:  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 189293. 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 189498, and in the edicules over the entrances of the Paris Métro that he designed for the 