Although, of course, the ruins one sees in the countryside, for example, were not always ruins, but at one time were complete and finished cities, or castles, or what-have-you. Or, anyway, were as complete and as finished as any architectural work can be. Completion is something of an illusion. There is always a brick whose mortar could use a little retouching, or a cobblestone that doesn’t quite fit, and that could have been replaced before the workers packed their tools and their equipment, and went away.