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Metaphorical images: linchpins and keystones

Dear Evangeline What a wonderful image!  Very interesting to compare these different metaphorical images: linchpins and keystones.  The keystone (on which you wanted to paint the Phi symbol) enables the structure to hold, by absorbing the tension between the twin oppositional pressures which push together in any arch. Meanwhile, the linchpin is what crucially allows...

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