It is comprehensible that the noticeable revolution in architecture should likewise affect the sister arts. Here, however, we encounter in the first rank two artistic characters essentially differing from one another. With Lorenzo Ghiberti the influence of the school of Giotto is very perceptible, and in the reliefs, his master-pieces, he allows the picturesque principle to predominate to a certain extent, and with a careful calculation of the effect, which to some degree surpasses the ability or courage of the painter so active in his youth. The attitudes and drapery, however, of Ghiberti’s figures are in harmony with the spirit of antiquity which had inspired Nicolò Pisano more than a century and a half earlier. The full outbreak of realism in conception and form is displayed in the somewhat younger Donatello, who, unpoetical and less imaginative than Ghiberti, depends for models rather upon real, if even less beautiful, nature, than upon works of antiquity, of which, indeed, Rome afforded him but scanty and doubtful specimens. Both were goldsmiths, whose art had at that time reached a high degree of perfection, and was distinguished by the production of great works. It was the profession which Brunellesco had originally followed, and for centuries remained connected with that of the sculptor. In 1408 Ghiberti, then only twenty-two, received the commission for his first bronze door of the Baptistery, the completion of which required more than twenty years. In 1414 he executed the statue of St. John, and six years later that of St. Matthew, for two niches on the exterior of the ground-floor of Or San Michele, the sculptural adornment of which, at the cost of the guilds, had been determined upon in 1406. In 1424 the execution of the second door of the Baptistery was entrusted to him, which was finished twenty-eight years after, three years before his death. One work of less importance remains from the year 1428—the bronze chest executed for the brothers Cosimo and Lorenzo de’ Medici for the reception of the relics belonging to the Camaldulensian convent of the Angeli.[37] In 1411 Donatello began the statue of St. Mark, which he produced, together with that of St. Peter, for Or San Michele; about 1420 he began the monument for Pope John XXIII.; and in 1427 he was commissioned by the Medici to execute the monument of Cardinal Rinaldo Brancacci for Naples. His most excellent work in respect to lightness and grace, and which is without a touch of the heaviness so often characteristic of him, is the statue of St. George for Or San Michele. The date of the production of this work can as little be determined as that of the excellent figures of the Prophets which adorn the niches on the belfry of Sta. Maria del Fiore.