Designers like Alvar Aalto (Finland), Arne Jacobsen (Denmark), Josef Frank (Sweden), and Maija Isola (Finland) began producing their work in the 1930s, ushering in a "golden era of Scandinavian design." Their works were influenced by constructivism, functionalism, and, in certain cases, surrealism. They also played an important role in spreading awareness about Nordic design abroad. For example, during the New York World's Fair of 1939-1940, American designers were encouraged to use materials from each part of Scandinavia in their products. This helped to promote the idea that all things Scandinavian were good looking and affordable. Scandinavian design has since become a way for countries across Northern Europe to represent themselves abroad. In addition to traditional designs, new brands have emerged in recent years featuring unique ideas derived from Scandinavian culture such as hippie clothes, jewelry, and furniture. Nordic people have also been going overseas for work opportunities since the 16th century. At first, these trips were made only occasionally but as time went on, they became more frequent. By the 19th century, many Swedes and Finns lived abroad for several years at a time working on construction projects in places like America, Australia, and Africa. Today, many more people are doing this kind of work than before, especially in Finland where many employees of Nokia and Metso are hired foreign.