It was through an accident that he came to study those works of the early Italian sculptors which suggested much of his own grandest work, and impressed it with so deep a sweetness. He believed in dreams and omens. One of his friends dreamed twice that Lorenzo, then lately dead, appeared to him in grey and dusty apparel. To Michelangelo this dream seemed to portend the troubles which afterwards really came, and with [79] the suddenness which was characteristic of all his movements, he left Florence. Having occasion to pass through Bologna, he neglected to procure the little seal of red wax which the stranger entering Bologna must carry on the thumb of his right hand. He had no money to pay the fine, and would have been thrown into prison had not one of the magistrates interposed. He remained in this man's house a whole year, rewarding his hospitality by readings from the Italian poets whom he loved. Bologna, with its endless colonnades and fantastic leaning towers, can never have been one of the lovelier cities of Italy. But about the portals of its vast unfinished churches and its dark shrines, half hidden by votive flowers and candles, lie some of the sweetest works of the early Tuscan sculptors, Giovanni da Pisa and Jacopo della Quercia, things as winsome as flowers; and the year which Michelangelo spent in copying these works was not a lost year. It was now, on returning to Florence, that he put forth that unique presentment of Bacchus, which expresses, not the mirthfulness of the god of wine, but his sleepy seriousness, his enthusiasm, his capacity for profound dreaming. No one ever expressed more truly than Michelangelo the notion of inspired sleep, of faces charged with dreams. A vast fragment of marble had long lain below the Loggia of Orcagna, and many a sculptor had had his thoughts of a design which should just fill this famous block of [80] stone, cutting the diamond, as it were, without loss. Under Michelangelo's hand it became the David which stood till lately on the steps of the Palazzo Vecchio, when it was replaced below the Loggia. Michelangelo was now thirty years old, and his reputation was established. Three great works fill the remainder of his life--three works often interrupted, carried on through a thousand hesitations, a thousand disappointments, quarrels with his patrons, quarrels with his family, quarrels perhaps most of all with himself--the Sistine Chapel, the Mausoleum of Julius the Second, and the Sacristy of San Lorenzo.