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Christmas, with the donkey and the ox in the crib. Epiphany, with the ‘galette des rois' in France, Palm-Sunday, Easter eggs... Where do Christian celebrations come from, and what purpose do they really serve, these festivities of God, celebrated by man and accompanied by sometimes astonishing customs? We find their origins, their evolutions and rites in history, theology, liturgy and anthropology. We also find the trail of magic they have left in our traditions and our art.