Sistine Chapel ceiling of the chapel, now closed, and those above the High Altar covered by the Last Judgement. Above each window is an arched shape, referred to as a lunette and above eight of the lunettes at the sides of the chapel are triangular "spandrels" filling the spaces between the side pendentives and the vault, the other eight lunettes each being below one of the corner pendentives. Michelangelo was commissioned to paint these areas as part of the work on the ceiling. The structures form visual bridges between the walls and the ceiling, and the figures which are painted on them are
Sistine Chapel exterior can be seen only from nearby windows and light-wells in the palace. Subsidence and cracking of masonry such as must also have affected the Cappella Maggiore has necessitated the building of very large buttresses to brace the exterior walls. The accretion of other buildings has further altered the exterior appearance of the Chapel. The building is divided into three stories of which the lowest is a very tall basement level with several utilitarian windows and a doorway giving onto the exterior court. Internally, the basement is robustly vaulted to support the chapel. Above is the main space, the Sistine