At that time Tribolo had finished a model for the shaft of the fountain in the labyrinth, in which are some Satyrs in low-relief, four masks in half-relief, and four little boys in the round, who are seated upon certain caulicoles. Vinci having then returned, Tribolo gave him this shaft to do, and he executed and finished it, making in it some delicate designs not employed by any other but himself, which greatly pleased all who saw them. Then, having had the whole marble tazza of that fountain finished, Tribolo thought of placing on the edge of it four children in the round, lying down and playing with their arms and legs in the water, in various attitudes; and these he intended to cast in bronze. Vinci, at the commission of Tribolo, made them of clay, and they were afterwards cast in bronze by Zanobi Lastricati, a sculptor and a man very experienced in matters of casting; and they were placed not long since around the fountain, where they make a most beautiful effect. There was in daily intercourse with Tribolo one Luca Martini, the proveditor at that time for the building of the Mercato Nuovo, who, praising highly the excellence in art and the fine character of Vinci, and desiring to help him, provided him with a piece of marble two-thirds of a braccio in height and one and a quarter in length. Vinci, taking the marble, made with it a Christ being scourged at the Column, in which the rules of low-relief and of design may be seen to have been well observed; and in truth it made everyone marvel, considering that he had not yet reached the age of seventeen, and had made in five years of study that proficience in art which others do not achieve save after length of life and great experience of many things. At this time Tribolo, having undertaken the office of superintendent of the drains in the city of Florence, ordained in that capacity that the drain in the old Piazza di S. Maria Novella should be raised from the ground, in such a way that, becoming more capacious, it might be better able to receive all the waters that ran into it from various quarters. For this work, then, he commissioned Vinci to make the model of a great mask of three braccia, which with its open mouth might swallow all the rain-water. Afterwards, by order of the Ufficiali della Torre, the work was allotted to Vinci, who, in order to execute it more quickly, summoned to his aid the sculptor Lorenzo Marignolli. In company with this master he finished it, making it from a block of hard-stone; and the work is such that it adorns the whole Piazza, with no small advantage to the city.