in the transept, the only part of the building that is known to have been completed as Brunelleschi designed it. The building in Renaissance architecture The Basilica of San Lorenzo demonstrates many innovative features of the developing style of Renaissance architecture, a simple mathematical proportional relationship using the square aisle bay as a module and the nave bays in a 2x1 ratio the use of an integrated system of column, arches, and entablatures, based on Roman Classical models the use of Classical proportions for the height of the columns a clear relationship between column and pilaster, the latter meant to be read as a type of embedded pier the use of spherical segments in the vaults of the side aisles the articulation of the structure in pietra serena (Italian: “serene stone”) According to one scholar, features such as the interior's Corinthian arcades and ceiling's flat panels mark "a departure from the Gothic and a return to the Romanesque Proto-Renaissance." At times, the design of San Lorenzo has met with criticism, particularly when compared with Santo Spirito, also in Florence and which is considered to have been constructed more or less in conformity with Brunelleschi's ideas, even though he died before most of it was built. By the sixteenth century, Giorgio Vasari commented that along the nave, the columns should have been elevated on plinths. The steps along the aisles, supporting the pilasters, also have been considered to deviate from Classical ideals. Outer and inner façades The Medici Pope Leo X gave Michelangelo the commission to design an outer façade of the basilica in white Carrara marble in 1518. Michelangelo made a large wooden model that shows how he adjusted the classical proportions of the facade, drawn to scale, after the ideal proportions of the human body, to the greater height of the nave. Although the outer facade of the basilica remained unbuilt, Michelangelo's large wooden model of it remains. Michelangelo did design and build the internal facade of the basilica that is seen from the nave looking back toward the entrances. It comprises three doors between two pilasters with garlands of oak and laurel and a balcony on two Corinthian columns. In recent years, the association of "Friends of the Elettrice Palatina" and the Comune of Florence re-visited the question of completing the outer facade of the basilica according to Michelangelo's designs. To assist with the public debate, a computerized