"Filippo also constructed a model for the lantern, with his own hand; it had eight sides, the proportions were in harmony with those of the cupola, and for the invention as well as variety and decoration, it was certainly very beautiful. He did not omit the staircase for ascending to the ball, which was an admirable thing; but as he had closed the entrance with a morsel of wood fixed at the lower part, no one but himself knew its position. Filippo was now highly renowned, but notwithstanding this, and although he had already overcome the envy and abated the arrogance of so many opponents, he could not yet escape the vexation of finding that all the masters of Florence, when his model had been seen, were setting themselves to make others in various manners; nay, there was even a lady of the Gaddi family, who ventured to place her knowledge in competition with that of Filippo. The latter, meanwhile, could not refrain from laughing at the presumption of these people, and when he was told by certain of his friends that he ought not to show his model to any artist lest they should learn from it, he replied that there was but one true model, and that the others were good for nothing. Some of the other masters had used parts of Filippo's model for their own, which, when the latter perceived, he remarked, 'The next model made by this personage will be mine altogether.' The work of Filippo was very highly praised, with the exception, that, not perceiving the staircase by which the ball was to be attained, the model was considered defective on that point. The superintendents determined, nevertheless, to give him the commission for the work, but on condition that he should show the staircase;[5] whereupon Filippo, removing the morsel of wood which he had placed at the foot of the stair, showed it constructed as it is now seen, within one of the piers, and presenting the form of a hollow reed or blow-pipe, having a recess or groove on one side, with bars of bronze, by means of which the summit was gradually attained. Filippo was now at an age which rendered it impossible that he should live to see the lantern completed; he therefore left directions, by his will, that it should be built after the model here described, and according to the rules which he had laid down in writing, affirming that the fabric would otherwise be in danger of falling, since, being constructed with the pointed arch, it required to be rendered secure by means of the pressure of the weight to be thus added. But, though Filippo could not complete the edifice before his death, he raised the lantern to the height of several braccia, causing almost all the marbles required for the completion of the building to be carefully prepared and brought to the place. At the sight of these huge masses as they arrived, the people stood amazed, marvelling that it should be possible for Filippo to propose the laying of such a weight on the cupola. It