let y1 = 0;

let x2 = 0;

let y2 = 0;

let noff = 0.0;

​

function setup() {

  createCanvas(700, 700);

  background(255);

  noStroke();

}

​

function draw() {

  noff = noff + 0.01;

  let n = noise(noff) * width/2

  rect(x1,y1,x1+n,y1);

  y1=y1+10;

  rect(x2,y2,x2,y2+n);

  x2=x2+10;

 if (frameCount%3 == 1) {fill(50)} else

   if (frameCount%3 == 2) {fill(255)} 

   if (frameCount%3 == 0) {fill(200)} else

​

  if (y1>750) {y1=0; x1=x1+n;}

  if (x2>750) {x2=0; y2=y2+n;}

  if (y2>750) {noLoop();}

​

}