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
Corinthian order tale in his illustration of the Corinthian order for his translation of Vitruvius, published in Paris, 1684 ("illustration, left"). Perrault demonstrates in his engraving how the proportions of the carved capital could be adjusted according to demands of the design, without offending. The texture and outline of Perrault's leaves is dry and tight compared to their 19th-century naturalism at the U.S. Capitol ("below, left"). A Corinthian capital may be seen as an enriched development of the Ionic capital, though one may have to look closely at a Corinthian capital ("illustration, right") to see the Ionic volutes ("helices"), at the corners,