The stone veneer of this facade is given a channeled rustication and serves as the background for the smooth-faced pilasters and entablatures which divide the facade into a series of three-story bays. The three stories of the Rucellai facade have different classical orders, as in the Colosseum, but with the Tuscan order at the base, a Renaissance original in place of the Ionic order at the second level, and a very simplified Corinthian order at the top level. Twin-lit, round-arched windows in the two upper stories are set within arches with highly pronounced voussoirs that spring from pilaster to pilaster. The facade is topped by a boldly projecting cornice.