The text presented here by Italian modernist architect and critic Ernesto Nathan Rogers (1909–69) is my translation of a brief article published in Lineastruttura 1 (1966): 6—original title “Qualche principio per l’architetto” (“Some Principles for the Architect”). Based in Naples, Italy, Lineastruttura was a short-lived publication (only two issues appeared between 1966 and 1967), envisioned by art critic and historian Giulio Carlo Argan (1909–92), who later also served as mayor of Rome (1976–79)—another example of the socially engaged public intellectual championed by Rogers himself. Argan had asked Lea Vergine (1936–2020), an art critic from Naples, very active on the national cultural scene through many publications, exhibitions and initiatives, to be the editor-in-chief and to further program and curate the magazine, under the graphic design supervision of renowned designer Enzo Mari (1932–2020). In spite of being already ill (he would die in 1969), Rogers accepted with enthusiasm the invitation from the editors to contribute for the opening issue, also given the quality of the cultural project of the magazine, an interdisciplinary platform for architecture, design, and visual arts. In presenting the essay in the magazine, the editors thanked him “for having affectionately endorsed our own initiative”—Argan was a close friend and collaborator of Rogers’, as he also sat on the editorial board of Casabella-Continuità, for which Rogers had been the editor-in-chief from 1953 to 1965.