Cathedrals and churches were traditionally constructed with the altar at the east end, so that the priest and congregation faced the rising sun during the morning liturgy. The sun was considered the symbol of Christ and the Second Coming, a major theme in Cathedral sculpture. The portion of the church east of altar is the choir, reserved for members of the clergy. There is usually a single or double ambulatory, or aisle, around the choir and east end, so parishioners and pilgrims could walk freely easily around east end.