The 115 cardinals tasked with electing a new pope have been locked in the Sistine Chapel, marking the start of conclave in Rome on Tuesday.
Monsignor Guido Marini, master of liturgical ceremonies, closed the double doors after shouting "Extra omnes," Latin for "all out," telling everyone but those taking part in the conclave to leave the frescoed hall. He then locked it.
During the voting that ensues, each cardinal writes his choice on a rectangular piece of paper inscribed with the words "Eligo in summen pontificem" -- Latin for "I elect as Supreme Pontiff."
Holding the folded ballot up in the air, each approaches the altar and places it on a saucer, before tipping it into an oval urn, as he intones these words: "I call as my witness, Christ the Lord, who will be my judge that my vote is given to the one who, before God, I think should be elected."
After the votes are counted, and the outcomes announced, the papers are bound together with a needle and thread, each ballot pierced through the word "Eligo." The ballots are then placed in a cast-iron stove and burned with a special chemical.
That's when all eyes will turn to the 6-foot-high copper chimney erected atop the Sistine Chapel to pipe out puffs of smoke to tell the world if there's a new pope.
Black smoke means "not yet" -- the likely outcome after Round 1. White smoke means the 266th pope has been chosen.
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