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In page Church (building):

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A common trait of the architecture of many churches is the shape of a cross[1] (a long central rectangle, with side rectangles and a rectangle in front for the altar space or sanctuary). These churches also often have a dome or other large vaulted space in the interior to represent or draw attention to the heavens. Other common shapes for churches include a circle, to represent eternity, or an octagon or similar star shape, to represent the church's bringing light to the world. Another common feature is the spire, a tall tower at the "west" end of the church or over the crossing.[citation needed]