The "Pietà" is probably one of the supreme sculptures of all time, but Michelangelo's next important work was to place him beyond all doubt in the rank of world sculptors. This was his "David." It is all the more interesting because of the difficulties under which he executed it. A huge block of marble of the finest vein lay in the works at Santa Maria del Fiore, Florence, which several sculptors had designed to make use of and at least two or three had begun work on, but then had given up. Michelangelo saw it and saw in it the possibilities of a heroic statue. He offered his design, it was accepted by the authorities, and he set to work. He built a workshop on the spot and shut himself up for eighteen months, absolutely refusing to let anyone see his work. The result was the "David" so well known. A copy of it was afterwards made in bronze and may be seen on the hill above Florence. It has often been said that the difference in impressiveness between the bronze and marble statues shows how much better adapted marble is for the expression of the human figure. The triumph of the artist, not only in the execution of this triumphant expression of youth, but also over the strict limitations of his materials, shows the eminently practical genius of the man who, at the age of thirty, was able to accomplish such a work. [Illustration: RAPHAEL, POPE JULIUS II] After these great sculptures, Michelangelo entered into a competition in painting and was chosen as a rival of Leonardo to decorate one side of the Council Hall of the Signory. Leonardo was already at work when Michelangelo received his {37} commission. Unfortunately neither of the paintings was ever completed. Only a portion of Leonardo's cartoon remains for us, though Michelangelo's, representing some Pisan soldiers surprised by Florentines while bathing in the Arno, is now at Holkham Hall in England and has been well engraved by Schiavonetti. This cartoon was the subject of much study by contemporaries, and Raphael particularly was greatly influenced by it. After this work Michelangelo was summoned to Rome by Pope Julius II and commissioned to make that great tomb which occupied so much of Angelo's attention for the next quarter of a century, caused him so many difficulties and disturbances of mind and was destined eventually to remain unfinished or at least to be of nothing like the significance that was originally planned. If one looks a little into Michelangelo's life at this time, surrounded as he was by the jealousies of his colleagues, disturbed at his work by political animosities of various kinds, by the slights of those who failed to appreciate and the open envy of those who favored his rivals, some idea of the difficulties of his artistic soul will be understood.