Meanwhile Baccio Bandinelli, having returned from Rome, where he had finished the tombs of Leo and Clement, persuaded the Lord Duke Cosimo, then a young man, to make at the head of the Great Hall of the Ducal Palace a facade full of columns and niches, with a range of fine marble statues; and this facade was to have windows of marble and grey-stone looking out upon the Piazza. The Duke having resolved to have this done, Bandinelli set his hand to making the design; but finding that the hall, as has been related in the Life of Cronaca, was out of square, and having never given attention to architecture, which he considered an art of little value, marvelling and even laughing at those who gave their attention to it, he was forced, on recognizing the difficulty of this work, to confer with Giuliano with regard to his model, and to beseech him that he, as an architect, should direct the work. And so all the stone-cutters and carvers of S. Maria del Fiore were set to work, and a beginning was made with the structure. Bandinelli had resolved, with the advice of Giuliano, to let the work remain out of square, following in part the course of the wall. It came to pass, therefore, that he was forced to make all the stones irregular in shape, preparing them with great labour by means of the pifferello, which is the instrument otherwise called the bevel-square; and this made the work so clumsy, that, as will be related in the Life of Bandinelli, it has been difficult to bring it to such a form as might be in harmony with the rest. Such a thing would not have happened if Bandinelli had possessed as much knowledge in architecture as he did in sculpture; not to mention that the great niches in the side-walls at each end proved to be squat, and that the one in the centre was not without defect, as will be told in the Life of that same Bandinelli. This work, after having been pursued for ten years, was abandoned, and so it remained for some time. It is true that the profiled stones as well as the columns, both of Fossato stone and of marble, were wrought with the greatest diligence by the stone-cutters and carvers under the care of Giuliano, and were afterwards so well built in that it would not be possible to find any masonry better put together, all the stones being accurately measured. In this respect Giuliano may be celebrated as most excellent; and the work, as will be related in the proper place, was finished in five months, with an addition, by Giorgio Vasari of Arezzo.