BTW Abelian Sandpile
Self-organized criticality: add grains, watch avalanches cascade across the grid
0 grains
1 grain
2 grains
3 grains
Toppling (≥4)
+ Add to Center
+ Add Random
Rain Grains
Reset
Fill to Critical
Grains: 0 | Topplings: 0 | Avalanche size: 0
Avalanche sizes follow power-law distribution P(s) ∝ s^−τ (τ ≈ 1.27 in 2D)