Bak-Tang-Wiesenfeld sandpile --- self-organized criticality produces power-law avalanche sizes without parameter tuning. Slow buildup with sudden cascading collapses
Standard analysis sees: right-skewed; aperiodic / broadband; homoskedastic; multifractal. The atlas finds no named structure, but the source is distinctively extreme on Attractor Reconstruction:lyap_sum (-4.0z) — beyond what the standard bank predicts for it. It sits beside Categorical Sensor in the atlas (standard-bank rank 33) — a neighbor conventional features miss.
Attractor Reconstruction:lyap_sum | -4.0z | bank-miss 1.3σ |
Nonstationarity:change_quantiles_high | +2.8z | bank-miss 1.2σ |








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| Nearest neighbor | Distance | |
|---|---|---|
| Continued Fractions | 3.58 | cross-domain |
| Categorical Sensor | 3.74 | |
| Earthquake Depths | 3.99 | cross-domain |
This source does not rank extreme on any metric.