A group of chiefly nonlinear mouldings used to decorate walls and ceilings, or any mouldings that does not otherwise fit into any other category. These include brackets, ornaments, central pieces, niches, panels, pilaster capitals, plaques, rail systems and rosettes. These are all measured by length and width, except rail systems which also include the thickness of the rail, niches which are measured by width and height and capitals which use width, height and depth.