Rotating Boxes - OpenProcessing

mySketch
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int angle = 0;
float t = 0;
​
void setup()
{
  size(1000,1000);
  rectMode(CENTER);
  background(0);
  smooth(8);
}
​
void draw()
{
  background(0);
  translate(width/2,height/2);
  noFill();
  stroke(255);
  strokeWeight(0.5);
  for(int i=0; i<=30; i++) {
     rotate(radians(i*.5)*t);
   rect(0,0,20*i,20*i);
  }
  t = sin(radians(angle));
  angle++;
}