For this purpose, then, Filippo had suspended, between two of the beams that supported the roof of the church, the half of a globe in the shape of an empty bowl, or rather, of a barber's basin, with the rim downwards; this half-globe was made of thin and light planks fastened to a star of iron which radiated round the curve of the said half-globe, and these planks narrowed towards the point of equilibrium in the centre, where there was a great ring of iron round which there radiated the iron star that secured the planks of the half-globe. The whole mass was upheld by a stout beam of pine-wood, well shod with iron, which lay across the timbers of the roof; and to this beam was fastened the ring that sustained and balanced the half-globe, which from the ground truly appeared like a Heaven. At the foot of the inner edge it had certain wooden brackets, large enough for one person to stand on and no more, and at the height of one braccio there was also an iron fastening, likewise on the inner edge; on each of these brackets there was placed a boy about twelve years old, who was girt round with the iron fastening one braccio and a half high, in such wise that he could not have fallen down even if he had wanted to. These boys, who were twelve in all, were placed on the brackets, as it has been said, and dressed like angels, with gilded wings and hair made of gold thread; and when it was time they took one another by the hand and waved their arms, so that they appeared to be dancing, and the rather as the half-globe was ever moving and turning round. Within it, above the heads of the angels, were three circles or garlands of lights, contained in certain little lamps that could not be overturned. From the ground these lights appeared like stars, and the brackets, being covered with cotton-wool, appeared like clouds. From the aforesaid ring there issued a very stout bar of iron, which had at the end another ring, to which there was fastened a thin rope reaching to the ground, as it will be told later. The said stout bar of iron had eight arms, spreading out in an arc large enough to fill the space within the hollow half-globe, and at the end of each arm there was a stand about the size of a trencher; on each stand was a boy about nine years old, well secured by an iron soldered on to the upper part of the arm, but loosely enough to allow him to turn in every direction. These eight angels, supported by the said iron, were lowered from the space within the half-globe by means of a small windlass that was unwound little by little, to a depth of eight braccia below the level of the square beams that support the roof, in such a manner that they were seen without concealing the view of the angels who were round the inner edge of the half-globe. In the midst of this cluster of eight angels--for so was it rightly called--was a mandorla of copper, hollow within, wherein were many holes showing certain little lamps fixed on