C - Category
A walled citadel of cities and towns with the traditional quarter clustered round it.
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A cassone or chest fitted with a back and arms and usually placed upon a dais used in Renaissance Italy.
A hinged chest or jewelry storage box used in Renaissance Italy.
A building that is furnished with turrets and battlements in the style of a castle.
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 barrel vault is the simplest form of a vault which uses a series of arches placed side by side, one after another. The curves are typically circular in shape, lending a semi-cylindrical appearance to the total design.
The box-like shapes in the ceilings of that are used to reduce the mass of the vaulting.
In historical buildings they could have been of any shape as long as their was a void in between.
A ceiling having a cove at its intersection with the wall.
A vault produced by the intersection at right angles of two 
barrel vaults. Sometimes the arches of groin vaults are pointed instead of round and the vault need only be supported at its four corners.
A ceiling or part of a ceiling that is lower than the primary ceiling structure. A furr down is often constructed to enclose ducts or pipe that cannot be installed in the ceiling framing spaces and must be installed below the standard ceiling level. The rectangular finished structure above kitchen cabinets is often referred to as a furr down.
Photo by stevecadmanA collection of ribs springing from a point and spreading out in the shape of a fan.