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 and passionate Christian beliefs. The Sistine Chapel is 40.9 metres long and 14 metres wide. The ceiling rises to 13.4 metres above the main floor of the chapel. The vault is of quite a complex design and it is unlikely that it was originally intended to have such elaborate decoration. Pier Matteo d'Amelia provided a plan for its decoration with the architectural elements picked out and the ceiling painted blue and dotted with gold stars, similar to that of the Arena Chapel decorated by Giotto at Padua. The chapel walls have three horizontal tiers with six windows in the upper