Viewing post #796179 by JRsbugs

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You are viewing a single post made by JRsbugs in the thread called Traveling through pictures.
Nov 27, 2011 7:11 PM CST
Name: Janet
Near Lincoln UK
I wish the Wiki article on Keystones showed up, but it can be found with a google search. Quoting from the article..

Quoting:A keystone is the wedge-shaped stone piece at the apex of a masonry vault or arch, which is the final piece placed during construction and locks all the stones into position, allowing the arch to bear weight.[1] This makes a keystone very important structurally.[2][3] Although a masonry arch or vault cannot be self-supporting until the keystone is placed, the keystone experiences the least stress of any of the voussoirs, due to its position at the apex.[4] Old keystones can decay due to vibration, a condition known as bald arch.

In a rib-vaulted ceiling, keystones may mark the intersections of two or more arched ribs. For aesthetic purposes, the keystone is sometimes larger than the other voussoirs, or embellished with a boss. Mannerist architects of the 16th century often designed arches with enlarged and slightly dropped keystones, as in the "church house" entrance portal at Colditz Castle (see image). Numerous examples are found in the work of Sebastiano Serlio, a 16th century Italian Mannerist architect.

Figurative use

The term is used figuratively to refer to the central supporting element of a larger structure, such as a theory or an organization, without which the whole structure would collapse.[3] Example: Trade is the keystone of modern civilization.

The U.S. state of Pennsylvania is called the "Keystone State" because of its central location and commercial and political importance among the 13 colonies. The notched keystone shape is sometimes used as a logo for the state. From this, the keystone shape became the logo of the Pennsylvania Railroad (PRR), the shoulder sleeve insignia of the 28th Infantry Division of the Pennsylvania National Guard, Little League Baseball (founded in Williamsport), and of Heinz Ketchup (headquartered in Pittsburgh).[citation needed] The PRR's passenger and mixed traffic locomotives had keystone numberplates. The keystone shape is also used on Pennsylvania's state route markers

It struck me as to why the keystone was used for the figure of Jesus, a keystone being a crucial support for the columns yet it is not a basal support, it is a small structure supporting all which is below it. It symbolises the connection between Jesus above and the world below as in one needs the other for strength.

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