Art Nouveau was a style popular around the turn of the 20th century characterized by organic, floral motifs and highly stylized curvilinear forms that bridged Neoclassicism and modernism. Key figures included Alphonse Mucha and Gustav Klimt. Art Deco emerged in the 1920s-1930s as an eclectic form influenced by sources like African art, machine technology, and architecture like skyscrapers. Piet Mondrian's abstract geometric style sought to eliminate representations of nature. The Bauhaus and De Stijl movements similarly aimed to integrate art and design with modern life and technology through clean, simplified forms.