Sistine Chapel ceiling of the Sistine Chapel. At the outset, the plaster, "intonaco", began to grow mold because it was too wet. Michelangelo had to remove it and start again. He then tried a new formula created by one of his assistants, Jacopo l'Indaco, which resisted mold and entered the Italian building tradition. Because he was painting "fresco", the plaster was laid in a new section every day, called a "giornata". At the beginning of each session, the edges would be scraped away and a new area laid down. The edges between "giornate" remain slightly visible; thus, they give a good idea of
Sistine Chapel ceiling cleanly defined outlines make each subject easily visible from the floor. Despite the height of the ceiling, the proportions of the "Creation of Adam" are such that when standing beneath it, "it appears as if the viewer could simply raise a finger and meet those of God and Adam". Vasari tells us that the ceiling is "unfinished", that its unveiling occurred before it could be reworked with gold leaf and vivid blue lapis lazuli as was customary with frescoes and in order to better link the ceiling with the walls below it which were highlighted with a great deal of