The cast stone is called a pyramidal or wedge-shaped stone that connects the ceilings of the vaults or arches. Usually the stone acts from the erection, with its size. The presence of such a castle stone adds its zest and logically completes any piece or arch.
Functionally, the cast stone has the role of strength and durability of the arched structure as a whole. In the beginning, an arch is being collected, and at the end a castle stone - a "lock" - is installed, it securely locks the structure.
In olden times, the signs or names of masters were applied to such stones. To date, castle stones have only a decorative and practical role, decorating the vaults and arches of door and window openings.
When used in the construction of a castle stone, the building acquires a finished, rich and reliable appearance, as well as a light atmosphere of special mystery.