Its revolutionary character was recognised by the architect and teacher Jacques-François Blondel, who illustrated the elevation of the façade in his "Architecture françoise" of 1752, remarking: "The entire merit of this building lies in the architecture itself... and its greatness of scale, which opens a practically new road for our French architects." Large arched windows fill the vast interior with natural light. The result is a simple two-storey west front with three tiers of elegant columns. The overall harmony of the building is, some say, only marred by the two mismatched towers.