The Church Altar Part is composed of two elements: the Retable and the Reredos. The Retable is a decorative structure that stands behind the altar, usually made of wood or stone. It often includes a painting or sculpture of religious figures. The Reredos is a large ornamental screen that is placed behind the altar, typically made of stone or wood and decorated with carvings or paintings. Together, the Retable and Reredos form the backdrop of the Church Altar Part.