Each turn is the next place b−1 → b−2 → b−3 → ···
Fraction and base
Current expansion 12 = 0.1 Base 3 · repeats every place
Select a digit to locate its place in the spiral.
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x = a0 + Σakb−k
ak is the colored digit at place k.
Each turn scales the next place by 1 / √b, so its area scales by 1 / b.