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The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...
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The nickname "Keystone State" originates with the agricultural and architectural term "keystone", and is based on the central role that Pennsylvania played geographically and functionally among the original Thirteen Colonies from which the nation was established, the important founding documents, including the Declaration of Independence and U ...
Above the window the flat surface of the arch remained without ornamentation or was pierced by small round windows. Romanesque art used, in addition to windows enclosed by the round arch, others surrounded by the trefoil or fan-arch, and even openings for light entirely Baroque in design, with arbitrarily curved arches.
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