Lao LaurentianLibrary, like Medici Mansion, is also an indoor building, with a corridor of 9.5× 10.5 meters, pilasters embedded in the wall and supported on scrolls. There is a marble staircase in the middle, which was regarded as an architectural art part earlier and was successfully designed. Various shapes, gorgeous and decorative. In the Middle Ages, the staircase was enclosed in a dark corner, and its decorative function was gradually recognized by people after the Renaissance. It was completed by vasari after Michelangelo's death.