The concept of 'measurement' becomes so fuzzy on reflection that it is quite surprising to have it appearing in physical theory at the most fundamental level.

Speakable and Unspeakable in Quantum Mechanics

Rankine, William John Macquorn

A party of astronomers went measuring of the earth,

And forty million meters they took to be its girth;

Five hundred million inches, though, go through from pole to pole;

So let's stick to inches, feet, and yards, and the good old three-foot rule.

Songs and Fables The Three-Foot Rule Stanza III

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