 Arcading on a large scale generally fulfils a structural purpose, but it is also used, generally on a smaller scale, as a decorative feature, both internally and externally where it is frequently "blind arcading" with only a wall or a narrow passage behind it.In Romanesque architecture, piers were often employed to support arches.They were built of masonry and square or rectangular in section, generally having a horizontal moulding representing a capital at the springing of the arch.