About 350 buildings were built between 1904 and 1907 under an urban plan designed by the engineer Frederik Næsser. The merger of unity and variety gave birth to a style known as Ål Stil. Buildings of the style have linear decor and echoes of both Jugendstil and vernacular elements, e.g. towers of stave churches or the crested roofs. One of the buildings, Swan Pharmacy, now hosts the Art Nouveau Centre. Jugendstil masterpieces of other Nordic countries include Engelbrektskyrkan (1914) and Royal Dramatic Theater (1901–1908) in Stockholm, Sweden and former City Library (now Danish National Business Archives) in Aarhus, Denmark (1898–1901). The architect of the latter is Hack Kampmann, then a proponent of National Romantic Style who also created Custom House, Theatre and Villa Kampen in Aarhus. Denmark's most notable art nouveau designer was the silversmith Georg Jensen. Модерн ("Modern") was very colourful Russian variation of Art Nouveau which appeared in Moscow and Saint Petersburg in 1898 with the publication of a new art journal, "Мир искусства" (transliteration: "Mir Iskusstva") ("The World of Art"), by Russian artists Alexandre Benois and Léon Bakst, and chief editor Sergei Diaghilev. The magazine organized exhibitions of leading Russian artists, including Mikhail Vrubel, Konstantin Somov, Isaac Levitan, and the book illustrator Ivan Bilibin. The World of Art style made less use of the vegetal and floral forms of French Art Nouveau; it drew heavily upon the bright colours and exotic designs of Russian folklore and fairy tales. The most influential contribution of the "World of Art" was the creation of a new ballet company, the "Ballets Russes", headed by Diaghilev, with costumes and sets designed by Bakst and Benois. The new ballet company premiered in Paris in 1909, and performed there every year through 1913. The exotic and colourful sets designed by Benois and Bakst had a major impact on French art and design. The costume and set designs were reproduced in the leading Paris magazines, "L'Illustration", "La Vie parisienne" and "Gazette du bon ton", and the Russian style became known in Paris as "à la Bakst".