Long DescriptionThe differently formalized versions of the basic post-and-lintel (column and entablature) system in classical architecture. The main orders are Doric, Ionic, and Corinthian. They are Greek in origin but occur in Roman versions. Tuscan is a simple variant of Roman Doric. The Composite capital combines Ionic volutes with Corinthian foliage. Though each order has its own conventions of design and proportion, there are many minor variations. Superimposed orders: orders on successive levels, customarily in the upward sequence of Tuscan, Doric, Ionic, Corinthian, Composite.