Reciprocal FramesRECIPROCAL FRAMES is an introductory book on reciprocal frames related to design science. The book expands my previous article The Wooden Roofs of Leonardo and the New Structural Research already published on the Nexus Network Journal (2008). These structures can be consideraded as forerunners to rigid tensegrity structures, wich can themselves be considered the forerunners to geodesic domes. At its most simple and natural form a design science