This issue of OASE looks at architectural drawings as dynamic processes that shape architectural thinking. To give insight into the relation between the tools and techniques for drawing, and the resulting architectural production and construction, OASE 105 draws from case studies that range from early sections in antiquity, the experimentation with drawing techniques on medieval construction sites, the automatization of orthographic drawing in the early Renaissance, to the more specific cases of George Aitchison’s elevations, John Ruskin’s drawing lessons, Heinrich Tessenow’s perspectives, El Lissitzky’s axonometric drawings, Lina Bo Bardi’s surrealist tableau’s and Tony Fretton’s CAD drawings.