Sistine Chapel ceiling of God, impassively watching and waiting on the fate of Humankind. Their painting demonstrates, more than any other figures on the ceiling, Michelangelo's mastery of anatomy and foreshortening and his enormous powers of invention. In their reflection of classical antiquity they resonate with Pope Julius' aspirations to lead Italy towards a new 'age of gold'; at the same time, they staked Michelangelo's claim to greatness. However, a number of critics were angered by their presence and nudity, including Pope Adrian VI who wanted the ceiling stripped. Michelangelo was the artistic heir to the great 15th-century sculptors and painters of Florence.
Restoration of the Sistine Chapel frescoes have been predicted by previous restorers. One of the major dangers to the frescoes is automotive exhaust, and they are also vulnerable to the effects of the crowds of tourists that pass through the chapel every day, bringing with them heat, humidity, dust and bacteria (the latter of which can biodegrade paints and pigments). The clean plaster surfaces are more in danger from these destructive elements than they were when they were covered with a layer of smoky wax. Previously, the Sistine Chapel's only ventilation was from its windows in the upper level of the walls. To prevent exhaust fumes