Barrel Vault Ceilings

A barrel vault, also known as a tunnel vault or a wagon vault, is an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance. The curves are typically circular in shape, lending a semi-cylindrical appearance to the total design. (Wikipedia)   Many variations of this theme including domes and clouds are part of this category.  Accent, lighting, recessed lighting  can create a dramatic feel.