Sistine Chapel ceiling according to the Gospel of Matthew. However, the genealogy is now incomplete, since the two lunettes of the windows in the Altar wall were destroyed by Michelangelo when he returned to the Sistine Chapel in 1537 to paint The Last Judgment. Only engravings, based on a drawing that has since been lost, remain of them. The sequence of tablets seems a little erratic as one plaque has four names, most have three or two, and two plaques have only one. Moreover, the progression moves from one side of the building to the other, but not consistently, and the figures the
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