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The note at the top of a stack of 12 pure fifths is different from the note at the top of a stack of 7 octaves.

Pythagorean Comma, defined approximately 2,500 years ago.

W. A. Mathieu, “Harmonic Experience” 1997

“Since modern Western musicians are so used to ‘the circle of fifths’ as a theoretical concept as well as a practical learning tool, it may be surprising to some that twelve perfectly tuned fifths stacked from from C do not equal some distant octave of C, and that there is hence no circle of perfect fifths.”