The Piazza del Campo was bustling on this crisp autumn morning. Bright sunshine created dramatic shadows. And it seemed as if every grandmother in town was here, charges in hand. Or in strollers. Probably a daily event, a chance to catch up with others, enjoy the sunshine, the fresh air, scented this day with roasting chestnuts. The brickwork of the piazza was the inspiration for Boston’s City Hall plaza, which, to put it mildly, somehow lacks the warmth and humanity of its Tuscan predecessor.