Sistine Chapel ceiling on the fictive cornice. Pictorially, the Ignudi appear to occupy a space between the narrative spaces and the space of the chapel itself. (see below) Along the central section of the ceiling, Michelangelo depicted nine scenes from the Book of Genesis, the first book of the Bible. The pictures are organized into three groups of three alternating large and small panels. The first group shows God creating the Heavens and the Earth. The second group shows God creating the first man and woman, Adam and Eve, and their disobedience of God and consequent expulsion from the Garden of Eden where
Sistine Chapel congregations. These included the Christmas Day and Easter masses, at which the Pope himself was the celebrant. The other 27 masses could be held in a smaller, less public space, for which the "Cappella Maggiore" was used before it was rebuilt on the same site as the Sistine Chapel. The "Cappella Maggiore" derived its name, the Greater Chapel, from the fact that there was another chapel also in use by the Pope and his retinue for daily worship. At the time of Pope Sixtus IV, this was the Chapel of Pope Nicholas V, which had been decorated by Fra Angelico.