in order to make the magnificent Palace and Convent of the Knights of S. Stephen on the same spot, using some part of the old, from the design and model of Giorgio Vasari, painter and architect of Arezzo, who has accommodated himself to those old walls as well as he has been able in fitting them into the new. Niccola made, likewise in Pisa, many other palaces and churches, and he was the first, since the loss of the good method of building, who made it the custom to found edifices in Pisa on piers, and on these to raise arches, piles having first been sunk under the said piers; because, with any other method, the solid base of the foundation cracked and the walls always collapsed, whereas the sinking of piles renders the edifice absolutely safe, even as experience shows. With his design, also, was made the Church of S. Michele in Borgo for the Monks of Camaldoli. But the most beautiful, the most ingenious, and the most whimsical work of architecture that Niccola ever made was the Campanile of S. Niccola in Pisa, where is the seat of the Friars of S. Augustine, for the reason that it is octagonal on the outer side and round within, with stairs that wind in a spiral and lead to the summit, leaving the hollow space in the middle free, in the shape of a well, and on every fourth step are columns that have the arches above them on a slant and wind round and round; wherefore, the spring of the vaulting resting on the said arches, one goes climbing to the summit in a manner that he who is on the ground always sees all those who are climbing, those who are climbing see those who are on the ground, and those who are halfway up see both the first and the second--that is, those who are above and those who are below. This fanciful invention, with better method and more just proportions, and with more adornment, was afterwards put into execution by the architect Bramante in the Belvedere in Rome, for Pope Julius II, and by Antonio da San Gallo in the well that is at Orvieto, by order of Pope Clement VII, as will be told when the time comes.