The smallest "house tombs" were box-like, masonry structures with perpendicular walls and low roofs. The walls afforded opportunities for decoration, including small wall-paintings, reliefs and mosaic walls and floors; extra floors could be added at need, above or below ground-level, to contain additional cremation urns, or inhumation burials. In some cases, mosaic floors within house tombs were carefully removed, an additional corpse interred, then the mosaic repaired and the whole resealed, with a "feeding tube" set into the mosaic to provide for the new interrment. The larger "house tombs" had a broad doorway, but also a lobby and several large rooms within. One chamber was used to host the dead's family memorial ceremony and feast. Other chambers housed anything thought necessary for the deceased and their family, including family portraits and other valued possessions, along with any paraphernalia required for memorial ceremonies.