One of the masterpieces of Borromini can be admired in Palazzo Spada, in Piazza Capo di Ferro, close to Campo de' Fiori. The palace which hosts the Council of State, was changed by Borromini who created in the space in front of the access to the courtyard an extraordinary perspective effect. The gallery is long just 9 meters but thanks to the row of columns built at a slight decreasing height and the pavement slowly going up, it seems to be illusionistically 37 meters long. The statue at the end of the gallery representing Mars seems to be as high as a man but it is just 60 centimeters.
