var cols;

var scl = 5;

var grid = [];

let zOff = 0;

let xStart;

let yStart;

​

function setup() {

  createCanvas(400, 400);

  rows = floor(width/scl);

  cols = floor(height/scl);

  xStart = random(10000);

  yStart = random(10000);

  // for(var i = 0; i < rows; i++){

  //   grid[i] = [];

  //   for(var j = 0; j < cols; j++){

  //     grid[i][j] = 0;

  //   }

  // }

}

​

​

function draw() {

  background(220);

  noStroke();

  let xOff = xStart;

  for(var i = 0; i < rows; i++){

    let yOff = yStart;

    for(var j = 0; j < cols; j++){

      let clr = noise(xOff,yOff,zOff);

      clr = map(clr,0,1,155,0);

      fill(color(clr,clr,clr));

      rect(i*scl,j*scl,10,10);

      yOff += 0.05;

    }

    xOff += 0.05;    

  }

  zOff += 0.0009;

  xStart -= noise(zOff) * 0.01;

}