Oslo being the first Opera House in the world to let people walk on the roof of the building. The foyer and the roof are also used for concerts as well as the three stages. Most great Norwegian authors have lived in Oslo for some period in their life. For instance, Nobel Prize-winning author Sigrid Undset grew up in Oslo, and described her life there in the autobiographical novel "Elleve år" (1934; translated as "The longest years"; New York 1971). The playwright Henrik Ibsen is probably the most famous Norwegian author. Ibsen wrote plays such as "Hedda Gabler", "Peer Gynt", "A
Master builder Master builder A master builder or master mason is a central figure leading construction projects in pre-modern times (a precursor to the modern architect and engineer). As one 1887 source described the status as follows: A 1926 source stated: The phrase has been in use since at least as early as 1610, when William Camden wrote in his "Britain, or a Chorographicall Description of the most flourishing Kingdomes, England, Scotland, and Ireland, and the Ilands adjoyning, out of the depth of Antiquitie" of "those Wings in Architecture, which the great Master builders tearme Peroma". Later in the same work, Camden