A common architecture for churches is the shape of a cross (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 on the "west" end of the
church or over the crossing.