2³⁰ sandpile

Gallery of single-source sandpiles. Each sandpile in the gallery starts from 2^d chips for some d.
Use the buttons at the bottom left/right to decrease/increase d.
The upper-left button switches between black-and-white and color versions of the image.
CTRL-f toggles fullscreen.
There are also galleries for the square lattice, the hexagonal lattice, and the trihexagonal lattice.