A diazotype of the Arp - Van Doesburg double house. An original drawing is not known. The longitudinal section shows the double house with three floors and foundation. There is representation of the surrounding grounds such as the front and back gardens. Some elements in the house are drawn such as cabinets, windows and two spiral staircases. On the upper left is the project name, below it is a rectangle, the bottom right corner of which is opened. A Latin cross is drawn in the rectangle.