Doric order The Roman architect Vitruvius, following contemporary practice, outlined in his treatise the procedure for laying out constructions based on a module, which he took to be one half a column's diameter, taken at the base. An illustration of Andrea Palladio's Doric order, as it was laid out, with modules identified, by Isaac Ware, in "The Four Books of Palladio's Architecture" (London, 1738) is illustrated at Vitruvian module. According to Vitruvius the height of Doric columns is six or seven times the diameter at the base. This gives the Doric columns a shorter, thicker look than Ionic columns, which have 8:1
The Five Orders of Architecture five orders, with indication of their shadows and the first principles of construction"; "The Five Orders of Architecture according to Giacomo Barozzio of Vignola, to Which are Added the Greek Orders"; and "The five orders of architecture, the casting of shadows and the first principles of construction based on the system of Vignola". The book tackles the five orders, Tuscan, Doric, Ionic, Corinthian, and Composite in separate sections, each subdivided in five parts on the colonnade, arcade, arcade with pedestal, individual pedestals, and entablatures and capitals. Following those 25 sections were some less related parts on cornices and other elements.