 But beyond these public buildings designed in the Nordic Classicism style, this same style was also used in timber constructed workers' housing, most famously in the Puu-Käpylä ("Wooden Käpylä") district of Helsinki (1920–1925) by Martti Välikangas.The around 165 houses of Puu-Käpylä, modelled on farmhouses, were built from traditional square log construction clad in vertical boarding, but the construction technique was rationalised with an on-site "factory" with a partly building element technique.The principle of standardization for housing generally would take off during this time.