 During the Romanesque period there was a development from this two-stage elevation to a three-stage elevation in which there is a gallery, known as a "triforium", between the arcade and the clerestory.This varies from a simple blind arcade decorating the walls, to a narrow arcaded passage, to a fully developed second story with a row of windows lighting the gallery.The eastern end of a Romanesque church is almost always semi-circular, with either a high chancel surrounded by an ambulatory as in France, or a square end from which an apse projects as in Germany and Italy.