Sistine Chapel ceiling ceiling include the four so-called Major prophets: Isaiah, Jeremiah, Ezekiel and Daniel. Of the remaining possibilities among the Twelve Minor Prophets, the three represented are Joel, Zechariah and Jonah. Although the prophets Joel and Zechariah are considered "minor" because of the comparatively small number of pages that their prophecy occupies in the Bible, each one produced prophesies of profound significance. They are often quoted, Joel for his "Your sons and your daughters shall prophesy, your elderly shall dream dreams and your youth shall see visions". These words are significant for Michelangelo's decorative scheme, where women take their place among men
Sistine Chapel exterior can be seen only from nearby windows and light-wells in the palace. Subsidence and cracking of masonry such as must also have affected the Cappella Maggiore has necessitated the building of very large buttresses to brace the exterior walls. The accretion of other buildings has further altered the exterior appearance of the Chapel. The building is divided into three stories of which the lowest is a very tall basement level with several utilitarian windows and a doorway giving onto the exterior court. Internally, the basement is robustly vaulted to support the chapel. Above is the main space, the Sistine