Entablature being called petrification. The structure of the entablature varies with the three classical orders: Doric, Ionic, and Corinthian. In each, the proportions of the subdivisions (architrave, frieze, cornice) are defined by the proportions of the column in the order. In Roman and Renaissance interpretations, it is usually approximately a quarter of the height of the column. Variants of entablature that do not fit these models are usually derived from them. Pure classical Doric entablature is simple. The architrave, the lowest band, is split, from bottom to top, into the guttae, the regulae, and the taenia. The frieze is dominated by
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,