Sistine Chapel
Papal conclave

One of the functions of the Sistine Chapel is as a venue for the election of each successive pope in a conclave of the College of Cardinals. On the occasion of a conclave, a chimney is installed in the roof of the chapel, from which smoke arises as a signal. If white smoke, which is created by burning the ballots of the election, appears, a new Pope has been elected. If no candidate receives the required two-thirds vote, the cardinals send up black smoke—created by burning the ballots along with wet straw and chemical additives—it means that no successful election has yet occurred.

The first papal conclave to be held on the Sistine Chapel was the conclave of 1492, which took place from 6 to 11 August of the same year and in which Pope Alexander VI, also known as Rodrigo Borja, was elected.

The conclave also provided for the cardinals a space in which they could hear mass, and in which they could eat, sleep, and pass time attended by servants. From 1455, conclaves have been held in the Vatican Palace; until the Great Schism, they were held in the Dominican convent of Santa Maria sopra Minerva. Since 1996, John Paul II 's Apostolic Constitution Universi Dominici gregis requires the cardinals to be lodged in the Domus Sanctae Marthae during a papal conclave, but to continue to vote in the Sistine Chapel.

Canopies for each cardinal-elector were once used during conclaves—a sign of equal dignity. After the new Pope accepts his election, he would give his new name; at this time, the other Cardinals would tug on a rope attached to their seats to lower their canopies. Until reforms instituted by Saint Pius X, the canopies were of different colours to designate which Cardinals had been appointed by which Pope. Paul VI abolished the canopies altogether, since, under his papacy, the population of the College of Cardinals had increased so much to the point that they would need to be seated in rows of two against the walls, making the canopies obstruct the view of the cardinals in the back row. In the wake of a conclave taking place to preserve the integrity of the marble floor on the Sistine Chapel, carpenters install a slightly elevated wooden floor alongside a wooden ramp in the entrance for those Cardinals who for one reason or another need to be transported in a wheelchair.
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