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 Lawn columns, that originally held the University's library. There are a total of 206 columns surrounding the Lawn: 16 on The Rotunda, 38 on the Pavilions, 152 on the walkways. The columns are of varying orders according to the formality and usage of the space, with Corinthian columns on the exterior of the Rotunda giving way to Doric, Ionic, and Composite orders inside; Doric, Ionic, or Corinthian on each of the pavilions; and a relatively humble Tuscan colonnade along the Lawn walkways. Jefferson's design for the Lawn sought to find an alternative to traditional single-building college architecture, such as that he