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| | Architecture and Geometry |
 | | A vault, in architecture, is an arch-shaped structure, usually of masonry, used as the ceiling of a room or other enclosed space, as the roof of a building, or as the support for a ceiling or roof. |
 | | The annular vault is similar to the barrel vault, except that the passage within it is not straight but curved, giving the entire structure the appearance of a portion of a ring. |
 | | In the simplest form of groined vault, the two conjoined vaults are of the same size and the floor of the vault is square; if the vaults are of different sizes, however, the floor of the vault is rectangular and the two areas of the ceiling between the groins are of unequal shape and size. |
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