Art Nouveau

Art Nouveau is an international style of art, architecture and applied art, especially the decorative arts, known in different languages by different names: Jugendstil in German, Stile Liberty in Italian, Modernisme in Catalan, etc. In English it is also known as the Modern Style (not to be confused with Modernism and Modern architecture). The style was most popular between 1890 and 1910. It was a reaction to the academic art, eclecticism and historicism of 19th century architecture and decoration and was inspired by natural forms and structures, particularly the curved lines of plants and flowers, and whiplash forms. Other defining characteristics of Art Nouveau were a sense of dynamism and movement, often given by asymmetry and by curving lines, and the use of modern materials, such as iron pillars and railings, sculpted and curved in naturalistic designs.^[2]

One major objective of Art Nouveau was to break down the traditional distinction between fine arts (especially painting and sculpture) and applied arts. It was most widely used in interior design, graphic arts, furniture, glass art, textiles, ceramics, jewelry and metal work. The style responded to leading nineteenth-century theoreticians, such as French architect Eugène-Emmanuel Viollet-le-Duc (1814–1879) and British art critic John Ruskin (1819–1900). In Britain, it was influenced by William Morris and the Arts and Crafts movement. German architects and designers sought a spiritually uplifting Gesamtkunstwerk (“total work of art”) that would unify the architecture, furnishings, and art in the interior in a common style, to uplift and inspire the residents. 

The first Art Nouveau houses and interior decoration appeared in Brussels in 1890s, in the architecture and interior design of houses designed by Paul Hankar, Henry Van de Velde, and especially Victor Horta, whose Hôtel Tassel in Brussels was completed in 1893. It moved quickly to Paris, where it was adapted by Hector Guimard, who saw Horta's work in Brussels and applied the style for the entrances of the new Paris Metro. It reached its peak at the 1900 Paris International Exposition, which introduced the Art Nouveau work of artists such as Louis Tiffany. It appeared in graphic arts in the posters of Alphonse Mucha, and the glassware of René Lalique and Émile Gallé.

From Belgium and France it spread to the rest of Europe, taking on different names and characteristics in each country. (See Naming section below.) It often appeared not only in capitals, but also in rapidly growing cities that wanted to establish artistic identities (Turin in Italy; Glasgow in Scotland; Munich and Darmstadt in Germany) as well as in centres of independence movements (Helsinki in Finland, then part of the Russian Empire; Barcelona in Catalonia, Spain).

By 1910, Art Nouveau's influence had faded. It was replaced as the dominant European architectural and decorative style first by Art Deco and then by Modernism.
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https://en.wikipedia.org/wiki/Art_Nouveau