[50] For it is plain that it is not only extraordinary, but utterly contrary to all reason, that one man should build a city. In what manner could he do it? He could not build even the most trifling portion of a house, unless he employed other men as his assistants. Would the same man be able at the same time to cut stones, to cut wood, to work in iron and in brass, and to throw the vast circumference of walls round the city? to build up propylaea, and inter-walls, and temples, and sacred precincts, and porticoes, and docks, and houses, and all the other public and private buildings which one is accustomed to find in a city? And moreover, besides all these things, would he be able to carry burdens, to move away masses of earth, to widen narrow passages, to make fountains and water-courses, and all the other things with which a city ought to be provided?