II.

Two Basic Plans

In general, two types of plans predominate: the basilica, processional in form, with a long axis running from a centered doorway to the altar at the other end of the building; and the centralized church, of circular or polygonal plan, with one large central space, usually with a dome overhead. The two basic shapes are combined in many different ways, and either one can be modulated to a crosslike form by the addition of projecting wings, either in the form of a Greek cross (with arms of equal length) or a Latin cross (with one longer arm, the nave). Elaborate churches may have separate rooms for baptism, for treasures and relics, for robing the clergy, and for administration. They may also have more than one altar and subsidiary chapels.