In what would have been a part of the right aisle of the larger Duomo, is the _Opera del Duomo_, the Cathedral Museum. On the ground floor is a room containing some of the original _graffiti_ from the pavement, where these have been replaced by copies, and some of the statues from the façade. Here, too, in a mutilated condition, are Giacomo della Quercia's reliefs from the Fonte Gaia: the Madonna and Child; the Virtues; the Creation of Adam and the Expulsion from Paradise (masterpieces which even in their ruin are superb), and less important fragments. There is a striking Moses, from a fountain in the Ghetto, probably by Federighi but scarcely unworthy of Giacomo himself. Also by Federighi are the bas-reliefs from the chapel in the Campo. A St John in terra-cotta by Giacomo Cozzarelli and a Transfiguration by Girolamo Genga of 1510 are also worthy of note. On the first floor, beyond the hall where designs and models are exhibited connected with the restoration of the pavement, is a small room containing original designs. Two, at least, are of first importance; the design for the façade of the Baptistery of Siena, by Giacomo di Mino del Pellicciaio (20); an old drawing said to represent Giotto's original design for the Campanile of Florence (34), crowned with the steeple that according to Vasari was abandoned "because it was a German thing and of antiquated fashion." There are also plans connected with the building of the Duomo (_e.g._ 60), and a curious sketch (33) for the suggested portico to the Campo, said to have been invented for Pandolfo Petrucci by Peruzzi and designed by a certain Pomarelli. On the stairs are the Baptism of Christ, by Andrea del Brescianino and his brother Raffaello, formerly in San Giovanni, and a modern plan of the abandoned enlargement of the Duomo.