The project Moduli 225 initiated in 1968 by Kristian Gullichsen and Juhani Pallasmaa takes its name from the basic dimension of the geometric module that organizes the 225 cm. These houses are built of wood, steel and glass. The cubic module forms the edges of the structure and each of these frames is divided into three parts of 75 cm, which can accommodate panels of this dimension: these may contain solid wall panels, doors, windows. The roof is flat and is constructed with panels made of two layers of wooden board including insulation glass wool. Although the design was initially earmarked for summer cottage, the house has been widely used as a primary residence. Through this system of prefabrication sixty houses were built between 1969 and 1973. The first was the summer residence of one of its creators, Kristian Gullichsen, on the outskirts of Helsinki.