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"The Mass of the Baptism of the Lord will again be celebrated in the Sistine chapel ad orientem. As Msgr. Marini explains 'this means that at some points the Pope will turn towards the Crucified, thus underlining the correct orientation of the Eucharistic celebration. This is not about turning the back to the people, but about assuming the same orientation as the assembly, which precisely looks toward the Crucified.' "
-- Msgr. Guido Marini, Pontifical Master of Liturgical Ceremonies. Read more here.