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|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. This makes a keystone very important structurally. 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. Old keystones can decay due to vibration, a condition known as bald arch.
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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