In the midst of his preparations for the making of the great tomb of Pope Julius, for which he spent nearly a year in the quarries up at Carrara obtaining the proper kind of marble and working out three or four statues while the men of the quarries were getting out the other marble that he wished, the execution of the tomb was put off. Fortunately the work done at this time was not entirely lost. The two galley slaves at the Louvre, which are among the greatest sculptures of their kind ever made, attest Michelangelo's industry, as well as genius, and they have been favorite studies of artists of all kinds ever since. When the execution of the tomb was put off Michelangelo was summoned to paint the vault of the Sistine Chapel. It is said that he owed this commission to the jealousy of rivals who hoped to discredit him. The Sistine Chapel is a most difficult room for effective decoration, since it is simply an oblong box with a low-vaulted ceiling. It was this ceiling that Michelangelo was supposed to decorate in fresco. He {38} refused at first to accept the commission, saying that he was no fresco painter, but the Pope insisted. For over three years, except when eating and sleeping, he was hidden behind the scaffolding, lying on his back most of the time painting above him, so that he could not read without placing his book above his head after a while. When the scaffold was taken down, the triumphant manifestation of his genius revealed one of the most superb monuments of art that the world possesses. As Grimm says, "If a man wants to get an idea of the art of Giotto and his pupils, architecture and painting together, he must go to the Campo Santo at Pisa; if he wants the masterpiece of the following art period, the extensive development that lies between Masaccio and Michelangelo, he must go to the Sistine Chapel." Fortunately for the after-time it is one of the few great decorative works of this time that can be studied as the artist left it, or at least without having to make allowance for the well-meant additions of restorers. The ceiling of the Sistine Chapel has been sadly injured by smoke and by water percolation from the roof and it has faded somewhat with time under the conditions of use of the chapel, but it has been spared from the misguided efforts of men by its position. A great Pope is said to have said, "There are two ways of ruining a work of art, by destruction and by restoration." He might well have added, especially in the light of what has happened even in the Vatican to Raphael and others, "and of the two the latter is the worse." From this Michelangelo's great work has happily been saved, and as a result it remains even in its damaged condition one of the acknowledged triumphs of human art, undoubtedly the greatest decorative work that has ever been done since the time of the Greeks.