how many times the round dance had been danced , hand in hand through the ages ; someone dancing tonight would have danced with old spurinna , and he might have held the hand of one of the older masters , and she in turn might have danced as a young girl with one of the elders next to her in the ring , that hands interlaced , and so on to the dawn of etruria , in one great circle of dance back to tarchies and tages ... servius he sat in the house of the curia he 'd had rebuilt , wondering why it was so easy to build up stone and timber , so difficult to build a city .