Letter From The Editor -- Letter From The Editor -- Architecture, Mathematics and Perspective -- Giotto and Renaissance Perspective -- Perspective, a Visionary Process: The Main Generative Road for Crossing Dimensions -- Perspective in a box -- Juan Bautista Villalpando and the Nature and Science of Architectural Drawing -- Perspective versus Stereotomy: From Quattrocento Polyhedral Rings to Sixteenth-Century Spanish Torus Vaults -- The Sunlight Effect of the Kukulcán Pyramid or The History of a Line -- Some Adaptations of Relativity in the 1920s and the Birth of Abstract Architecture -- Book Reviews -- The Mirror, the Window, and the Telescope: How Renaissance Linear Perspective Changed Our Vision of the Universe -- The Geometry of an Art. The History of Perspective from Alberti to Monge -- Forma y Representación. Un Análisis Geométrico.