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Sylvie Duvernoy. The 2003 Leonardo Construction Project.- Kim Williams. Transcription and Translation of F. 899v, Codex Atlanticus.- Rinus Roelofs. Two- and Three-Dimensional .-Constructions Based on Leonardo Grids.- Biagio Di Carlo. The Wooden Roofs of Leonardo and New Structural Research.- Sylvie Duvernoy. Leonardo and Theoretical Mathematics.- Mark Reynolds. The Octagon in Leonardo’s Drawings.- João Pedro Xavier. Leonardo’s Representational Technique for Centrally-Planned Temples.- Vesna Petresin. Perception of Order and Ambiguity in Leonardo’s Design Concepts.- Christopher Glass. Leonardo’s successors.- Rachel Fletcher. Dynamic Root Rectangles Part Two: Root-Two and Root-Three Rectangles; Design Applications.- Jane Burry. The Other Mathematical Bridge.- Book reviews.