It is said that there was in Florence a man of very good repute, most praiseworthy in his way of life and active in his business, whose name was Ser Brunellesco di Lippo Lapi, who had had a grandfather called Cambio, who was a learned person and the son of a physician very famous in those times, named Maestro Ventura Bacherini. Now Ser Brunellesco, taking to wife a most excellent young woman from the noble family of the Spini, received, as part payment of her dowry, a house wherein he and his sons dwelt to the day of their death. This house stands opposite to one side of S. Michele Berteldi, in a close past the Piazza degli Agli. The while that he was occupying himself thus and living happily, in the year 1398 there was born to him a son, to whom he gave the name Filippo, after his own father, now dead; and he celebrated this birth with the greatest gladness possible. Thereupon he taught him in his childhood, with the utmost attention, the first rudiments of letters, wherein the boy showed himself so ingenious and so lofty in spirit that his brain was often in doubt, as if he did not care to become very perfect in them--nay, it appeared that he directed his thoughts on matters of greater utility--wherefore Ser Brunellesco, who wished him to follow his own vocation of notary, or that of his great-great-grandfather, was very much displeased. But seeing him continually investigating ingenious problems of art and mechanics, he made him learn arithmetic and writing, and then apprenticed him to the goldsmith's art with one his friend, to the end that he might learn design. And this gave great satisfaction to Filippo, who, not many years after beginning to learn and to practise that art, could set precious stones better than any old craftsman in that vocation. He occupied himself with niello and with making larger works, such as some figures in silver, whereof two, half-length prophets, are placed at the head of the altar of S. Jacopo in Pistoia; these figures, which are held very beautiful, were wrought by him for the Wardens of Works in that city; and he made works in low-relief, wherein he showed that he had so great knowledge in his vocation that his intellect must needs overstep the bounds of that art. Wherefore, having made acquaintance with certain studious persons, he began to penetrate with his fancy into questions of time, of motion, of weights, and of wheels, and how the latter can be made to revolve, and by what means they can be set in motion; and thus he made some very good and very beautiful clocks with his own hand.