 Integrated sculpture on buildings can range from full-figure statues to caryatids and atlantes; multi-figure allegorical pediments and the occasional quadriga; bas-relief panels, carved friezes, keystones, gargoyles, figures or designs on spandrels and tympana, cornices, brackets, columns and capitals, and decorative brickwork.Architectural sculptures were made from a variety of materials which includes carved stone such as brownstone, terra cotta, cast iron, machine pressed sheet zinc, concrete and other materials.Terra cotta formed in plaster molds started to become the most popular material used in US cities in the 1870s.