 The 1950s also marked the beginning not only of greater population migration to the cities but also state financed projects for social housing.A key early example is the so-called "Käärmetalo" (literally "Snake house", though usually referred to in English as the "Serpentine house"), (1949–1951) by Yrjö Lindegren; built using traditional building techniques, plastered brick, the building nevertheless has a modern snake-like form that follows the topography of the area whilst also creating small pocket-like yards for the residents.But beyond the matter of form, was the production of mass housing based on systems of standardisation and prefabricated element construction.