What is Lunette

This paper is based on some considerations on the inter-scalar figurative relations which bind all of its constituents and elements of detail, within a work of architecture. This relation can be an environment in which to study the portal created by Francesco Borromini and the door cornices, inside Palazzo Falconieri, so far ignored by historiography. The text contextualizes these analysis and observations within Borromini's relationship with antiquity focusing on the role of design and of geometry in the definition of his language. The original drawings of the project and the construction of the entry portal to the apartment of Orazio Falconieri were used to evaluate the relationship between the drawings and what was built, based on the data of the direct survey considered, in this case, as the most effective instrument of knowledge. The results, though partial, permit the clarification of some of the construction events related to the Palazzo.