Group architects studio 24H Architects from the city of Rotterdam who designed two houses in rural Leiden, a city and town in the province of South Holland in Nivrlandz. According to the architect, interface every house, clearly inspired by the "new art" style, an echo of the narrow valley, which runs into the house and encases drawers. High population density of the area and the streets are very narrow. To provide the residents of the two houses with the greatest daylight, came the so-called narrow valley as a solution to this problem. This narrow valley continue within the home and encases drawers. Where it was directed so as to light up even the lowest floors. The walls of the narrow valley used to separate the home to the Chiefs necessary. There is no other walls and this relates to the narrow valley in all rooms. According to the desire, the walls can be made transparent or purifier to daylight. According to need, it has been making some of its walls closed and allow the development of toilets and showers behind these walls. Facade echoes so narrow valley. Steel used in the construction of the narrow valley instead of wood in the rest of the user interface..