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The amazing, autotuning sandpile, nautil.us/issue/23/dominoes/th

Jordan Ellenberg on abelian sandpile models (en.wikipedia.org/wiki/Abelian_), with pretty pictures of the fractal patterns they generate, from 2015.

These patterns are still a topic of active research; see e.g. "The Apollonian structure of integer superharmonic matrices", Ann. Math. 2017, annals.math.princeton.edu/2017, and "Harmonic dynamics of the abelian sandpile", PNAS 2019, doi.org/10.1073/pnas.181201511

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