The first door on the left is called the Door of Death because at one time it was the exit for funeral processions. The scenes sculpted between 1961 and 1964 by Giacomo Manzù (1908-1991) in accordance with the wishes of John XXIII (1958-1963), express the Christian meaning of death in ten episodes. - Source
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It's often criticized by some as too modern - therefore decadent. Yet the sculptor chosen, Giacomo Manzu, whose style was familiar to Pope Pius XII, was chosen for the project while Pius was alive.