Joel wrote:
> What's a keystone and how does it come to be applied to this kind of
> distortion?
A keystone is a piece of cut masonary used as the top piece in a stone (brick)
arch as found in window openings, door openings, bridges etc. I guess it's
called
a "keystone" because without it the whole structure collapses. It is a stone
shaped such that it is tapered.
...Wayne
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