Co-Evolution of Problem and Solution Spaces in Creative Design An Essay by Nigel Cross & Kees Dorst www.researchgate.net Between the two spaces What the prototype tells youSolution to evaluation and back againIn terms which must be alteredPrimitive design
53. Main Gateways Problem: Any part of town—large or small—which is to be identified by its inhabitants as a precinct of some kind, will be reinforced, helped in its distinctness, marked, and made more vivid, if the paths which enter it are marked by gateways where they cross the boundary. Solution: Mark every boundary in the city which has important human meaning—the boundary of a building cluster, a neighborhood, a precinct—by great gateways where the major entering paths cross the boundary. Christopher Alexander, Murray Silverstein & Sara Ishikawa, A Pattern Language 112. Entrance Transition