Until the 1910s, the kerosene lamp was the standard lighting in both simple and finer homes in Sweden, and it was only later that the light bulb became a common feature. Early designed ceiling lamps are often characterized by exposed light bulbs, as it was a way to show modern features in the interior. Josef Frank's Spindee lamps are examples of such lamps, and so are the light bulbs that hang in the stairwell at Prins Eugens Waldemarsudde in Stockholm. When the palace was built in 1903 – 1905, it was provided with modern innovations such as electricity and central heating, and the light bulbs were one of the modern choices made by the architect Ferdinand Boberg.