Why Sketch? An Essay from Field Notes on Science and Nature by Jenny Keller What you have observed closelyA single imageParallel refinementColor reproductionThe negative spaces+4 More Conversational drawingThe Beauty of the Overlooked
What the problem is Sometimes the problem is to discover what the problem is. Gordon Clegg, The Design of Design (Cambridge Engineering Series) The heart of systems engineeringComplete and consistent requirements problemsdesignux