The cafeteria and shadow surface project is located in Sacavem, on the periphery of Lisbon. These work is very special for ateliermob, since it represents their first public work. Integrated in the renovation of Av. do Estado da India (main traffic axes of Sacavem), they designed two different constructions in between buildings. Called Shadow Surface, the structure consists of a large concrete roof supported by three walls, providing a sheltered space for the residents to meet and sit in the shared courtyard. The cafeteria closes the children public playground and links different axes of circulation. The shadow surface plotted on the top of the public square and over the parking, tries to thread and gather all the different content and functionalities of the square. The concrete slab, which was cast in-situ, is randomly punctured with holes to allow sunlight and rain through.