Loop - OpenProcessing

mySketch
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function setup() {
  createCanvas(windowWidth, windowHeight);
  background(100);
  frameRate(10);
​
}
​
function draw() {
  background(255);
  
  
  //Matrix
  for (y=100; y<height; y+=100)
  {
    for(x=100; x<width; x+=100)
    {
      r=random(30); 
    }
  }
  
  
    for (y=100; y<height; y+=100)
  {
    for(x=100; x<width; x+=100)
    {
      push();
      r=random(40)
      noStroke();
      fill(random(150),random(255),255);
      translate(x,y);
      rotate(sin(millis()/1000));
      rect(0,0,r,r);    
      pop();
    }
  }
}