let zoom = 0;

​

function setup() {

  createCanvas(400, 400);

  noStroke();

}

​

function draw() {

  zoom = mouseX + mouseY;

  background(220);

  for (let x=0; x<width; x+=size) {

    for (let y=0; y<height; y+=size) {

      let c = noise(x/zoom, y/zoom, frameCount / 250) * 255;

      fill(0, c, 127);

      push();

      translate(x, y);

      rect(0, 0, size, size);

      pop();

    }

  }

}