"Heavier and more sculptural in effect than its predecessor (S. Lorenzo), S. Spirito is also simpler with regard to ornament and embellishment. The soffits of the arches, for example, and the impost blocks atop the capitals of the nave colonnade, are without carved relief. This emphasis on form without decorative overlay, on the depth of the wall, and on the three-dimensional character of the membering, reflected an escalating Classicism in Brunelleschi's work during the 1430s." --Trachtenberg, M. and Hyman, I. Architecture: from Prehistory to Post-Modernism. p. 292.
15th Century (1400 - 1499 CE) Renaissance
Furnari, M. (1995). Formal Design in Renaissance Architecture from Brunelleschi to Palladio. New York: Rizzoli International publications. p.92