The perspective window. Origins in Malmö and its introduction in the architecture of the 1950s in Madrid

The perspective window was first developed in Malmö in 1937 by architect Sigfrid Eric Persson. This is a pivot window, with wooden frames and profiles, and with the possibility of fitting a venetian blind between two panes of glass. From 1945, coinciding with the end of World War II, Persson introduced an aluminum variant. It was then that the window was marketed outside Sweden. For example, to Spain, where it arrived through the architects Miguel Fisac and Mariano Garrigues. Both traveled on their own to Sweden in 1949 and, a few years later, put it into practice in three buildings in Madrid: the Patronato Juan de la Cierva, the Instituto Cajal and the Casa de Suecia. This article deals with this Spanish-Swedish connection, based on a constructive element that is as concrete as it is essential.