Sand Pile Model

Sand Pile Model: "This cellular automata models a granular material in a gravitational field. There are two kinds of cells. Immovable ground cells and movable sand grains. Grains fall from a source at the top of the window and proceed down to the ground. Grains pile up and redistribute themselves according to the cellular automata rules. Application of the rule is a little more sophisticated than the Game of Life or Forest Fire rules."