the emergence of many ancient service-sector professions was simply a result of the fact that wherever and whenever there has been a large, sustained energy surplus, people (and other organisms) have found creative ways to put it to work. In the human case, this involved the development of a myriad of remarkable and very different skills, the learning and execution of which often brings us great satisfaction. This is why cities have always been crucibles of artistry, intrigue, curiosity, and discovery.
