Detail of the southern façade of the Nunnery's northern building. This is easily the grandest building of the Nunnery complex. At court level, it has two small but stately structures flanking a broad stairway that raises the main building high over the level of the other three that form the quadrangle. The Northern building once displayed seven flying façades projecting over the level of the upper cornice. These façades were composed of elaborate stacks of deity masks. Currently only three of these flying façades survive on the building's western wing, but they are of great help in visualizing the impression the whole complex must have once produced.