sawmills, glassworks, and brickworks were established along the rivers Lysakerelven and Sandvikselva in the following centuries. There were orchards and other agricultural concerns throughout the area, remnants of which still exist today. A number of artists established themselves in Bærum, particularly around the art school run by Johan Fredrik Eckersberg. Among the artists who did much of their work in Bærum are Frits Thaulow, Christian Skredsvig, Harriet Backer, Kitty Lange Kielland, Otto Sinding, Eilif Pettersen, Gerhardt Munthe, and Erik Werenskiold. Starting in the mid-20th century, Bærum's agricultural base gradually gave way to residential construction. Still, only a third of the area, , is built up for residential use; over half is productive forestry; and nearly is still agricultural. In 2010, that year's Eurovision Song Contest was hosted in Bærum. On 10 August 2019, a gunman opened fire on congregants at the Al-Noor Islamic Centre. Geography The physical geography of Bærum is dominated by a craggy coastline along the Oslofjord and inland, hilly areas rising to the north and east, where there are large forested areas. The mountain of Kolsås forms a natural center, but the municipality also includes the secluded valley of Lommedalen. Four major rivers flow through the municipality: Lysakerelven, Sandvikselva, Lomma, and Øverlandselva, and there are numerous lakes, both in residential and forested areas. The official municipality flower is Anemone ranunculoides. The geology of Bærum is part of the Oslo Graben and includes Rhomb porphyry at Kolsås. Since nearly two-thirds of Bærum's area consists of forests, there are rich opportunities for outdoor activities, such as skiing, hiking, and fishing. The forests are considered part of Marka, the forested areas in and around Greater Oslo. Areas within the municipality of Bærum include Bærumsmarka, Vestmarka, and Krokskogen. The highest point in Bærum is Vidvangshøgda at with an altitude of . The largest lake is Stovivatnet with an area of at Economy Bærum's industrial base has since the 1950s given way to service industries, including retailing, engineering, public services, etc. It derives much of its tax base by being a bedroom community to Oslo. It is one of the most affluent areas in Norway. Two of Norway's busiest highways (E18 and E16) and one railroad traverse the municipality. There has been considerable development of office parks along E18, especially around Lysaker in the last 20–30 years, reducing some of the pressure on downtown areas of Oslo. Scandinavian Airlines System Norway has