The device is a reusable coordinate system rather than an isolated simile. Its declared conversion lets the reader connect examples across very different magnitudes while the uncertainty note distinguishes exact-looking placement from the quality of the underlying dates.
Reusing the mapping lets a familiar position carry a new explanatory task. The image establishes the scale of the question without pretending to choose among its possible answers.
The familiar result is accompanied by an inspectable route. The reader can distinguish the arithmetic from the conventional assumptions about a printed page and from the biological input that the demonstration itself does not establish.
Reviewed examples have a source-linked editorial interpretation. Detected candidates are exact passages or structures retrieved by an explicit rule and still need interpretation. Neither label establishes a cause of bestseller longevity. No missing text is counted as a negative example.
