The pope unveiled the scene, which is apparently based on St. Matthew's version of the nativity and does not include the stable and manger typically associated with nativity scenes, ANSA reported Tuesday. The ribbon on the scene was cut Monday.

St. Matthew's version of Jesus' birth states Joseph took Mary into his house and that is where she gave birth. The version makes no mention of a journey to Bethlehem.

The pontiff recently spoke on the importance of nativity scenes and Christmas trees to the world's 1.1 billion Catholics.

''They are elements of that typical Christmas atmosphere which is part of the spiritual patrimony of our communities,'' he said. The pope said the items created a climate ''infused with religious feeling and family intimacy.''