SANDPILE

SELF-ORGANIZED CRITICALITY · BAK–TANG–WIESENFELD

warming up the desert…
EMITTER — WHERE THE SAND FALLS
DRIVE
GRID
SHOW
AVALANCHE SPECTRUM · N(s) vs s, log–log
collecting cascades…
drag to orbit · click the pile to drop sand · press D to draw · H for all keys

SANDPILE — KEYS

1 – 4emitter: center / twin / ring / rain
0emitter off — hands-on mode
Ddraw mode — paint sand with the brush
clickdrop a pinch of sand on the pile
Spacepause / resume the drive
Fseed a full house (every cell at 3)
Cclear the desert
+ / −raise / lower the drop rate
Atoggle sonification
Rtoggle auto-orbit
Gtoggle bloom
Ssave a PNG snapshot
Hthis help

a cell with 4 grains topples, passing one to each neighbour — avalanches follow a power law, just like earthquakes · click to close