IT IS NOW more than twenty years since the writer joined a first‐year ONC course and listened to the lecturer explaining the principles of orthographic projection. The front‐vertical and horizontal planes were the covers of the register case and the side‐vertical plane was the register itself. Even from this distance in time how simple and straightforward the exposition appeared to be. Within ten minutes of its starting this student was busy with his first drawing and never since then has he experienced any difficulty whatsoever with either first or third angle projection or with auxiliary views.