createCanvas(400, 400);

}

​

function draw() {

  background(220);

  rectRec(100,100,100)

}

​

function rectRec(x,y,size){

  rect(x,y,size,size,3);

  if (size>10){

    rect(x+random(0,5),y+random(0,5),size/1.6,size/1.6,3);

  }

}

​