// The canvas is divided into a grid of cells, each cell holds a certain number of sand grains.

// if 4 sand grains are added to one cell the cell topples! It is reset to 0 grains and the grains move to neighbouring cells

// this can trigger a chain reaction of toppling cells :) the model is symmetrical so adding grains to just one cell can create really neat patterns!

// breaking the symmetry with just one or two random grains can completely break this! 

// Try it out! right click to fast add sand or left click to add grain at a time.

// feel free to use this code as a boilerplate for your own project :)

// -Euan Ripper

​

let cols = 100;//define the resolution of the display

let rows = 100;

let grid = [];//initialise a grid to store each cell

let lastUpdate = [];

let delayTime = 100;

let cellSize = 6;  bsp;//size of each cell allows for visual scaling

​

function setup() {//initialise the display

  bsp;createCanvas(cols * cellSize, rows * cellSize);

​