Rococo’s most significant later interpretation occurred internationally from about 1880 to 1915, when designers found inspiration in the natural flow of the rococo aesthetic for a new design concept known as Art Nouveau. While the austere geometry of modernism governed much of design thinking during the twentieth century, designers continually returned to organic, natural curves as a source of inspiration in the 1930s, 1950s, and the psychedelic 1960s. More recently, the rococo spirit has burst forth once again as a creative force.