Classical order Classical order An order in architecture is a certain assemblage of parts subject to uniform established proportions, regulated by the office that each part has to perform. Coming down to the present from Ancient Greek and Ancient Roman civilization, the architectural orders are the styles of classical architecture, each distinguished by its proportions and characteristic profiles and details, and most readily recognizable by the type of column employed. The three orders of architecture—the Doric, Ionic, and Corinthian—originated in Greece. To these the Romans added, in practice if not in name, the Tuscan, which they made simpler than Doric, and the
Corinthian order banding that forms the base of the capital, recalling the base of the legendary basket. Most buildings (and most clients) are satisfied with just two orders. When orders are superposed one above another, as they are at the Flavian Amphitheater—the Colosseum—the natural progression is from sturdiest and plainest (Doric) at the bottom, to slenderest and richest (Corinthian) at the top. The Colosseum's topmost tier has an unusual order that came to be known as the Composite order during the 16th century. The mid-16th-century Italians, especially Sebastiano Serlio and Jacopo Barozzi da Vignola, who established a canonic version of the orders,