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This volume features nine papers guest edited by José Calvo-Lopez dedicated to the theme "From Mediaeval Stonecutting to Projective Geometry. " The topics discussed range from theoretical mathematics to built examples, both historical and contemporary.

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The Autumn 2011 (vol. 13 no. 3) issue of the Nexus Network Journal features nine papers guest edited by José Calvo-Lopez dedicated to the theme "From Mediaeval Stonecutting to Projective Geometry ". This is an outgrowth of the session by the same name which took place during the eighth international, interdisciplinary conference "Nexus 2010: Relationships between Architecture and Mathematics, held in Porto, Portugal, in June 2010. The topics discussed range from the theoretical mathematics to built examples both historical and contemporary. The issue is completed with other research papers, conference reports and book reviews.

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José Calvo-López: From Mediaeval Stonecutting to Projective Geometry.- José Carlos Palacios Gonzalo and Rafael Martín Talaverano: Geometric Tools in Juan De µlava´s Stonecutting Workshop.- Ana López Mozo: Ovals for Any Given Proportion in Architecture: A Layout Possibly Known in the Sixteenth Century.- Giuseppe Fallacara, Fiore Resta, Nicoletta Spallucci and Luc Tamboréro: The Vault of the Hôtel de Ville in Arles.- Rocío Carvajal Alcaide: Stairs in the Architecture Notebook of Juan de Portor y Castro: An Insight into Ruled Surfaces.- Miguel Alonso Rodríguez, Elena Pliego de Andrés and Alberto Sanjurjo µlvarez: Graphical Tools for an Epistemological Shift. The Contribution of Protoaxonometrical Drawing to the Development of Stonecutting Treatises.- Marta Salvatore: Prodromes of Descriptive Geometry in the Traité de stéréotomie by Amédée Fran‡ois Frézier.- Snezana Lawrence: Developable Surfaces: Their History and Application.- Enrique Rabasa: La Gournerie versus Monge.- Michael J. Ostwald: A Justified Plan Graph Analysis of the Early Houses (1975-1982) of Glenn Murcutt.- Aineias Oikonomou: The Use of the Module, Metric Models and Triangular Tracing in the Traditional Architecture of Northern Greece.

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