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
Basilica of San Bernardino in three different architectural orders: the first in doric order, the second ionic and the third corinthian. On the trabeation of the first order there are illustrated metops, on the second order there is a refined triple lancet window, which was added during the restoration work in the 18th century, and on the third order there are three big oculuses. Four sequences of double columns vertically divide the church, establishing a suggestive and harmonic diagram of nine squares on three lines. The principal gate is embedded by spiral columns. The lunette includes a Silvestro dell'Aquila's high relief illustrating "Madonna with