void setup() 
{
  size(500, 500);
  noStroke();
  smooth();
  noLoop();
}

void draw() 
{
  drawCircle(250, 200, 170, 6);
}

void drawCircle(float x, float y, int radius, float level) 
{                    
  float tt = 126 * level/4.0;
  fill(tt, 153);
  ellipse(x, y, radius*2, radius*2);      
  if(level > 1) {
    level = level - 0.5;
    int num = int(random(2, 6));
    for(int i=0; i<num; i++) {
      float a = random(0, TWO_PI);
      float nx = x + sin(a) * 6.0 * level;
      float ny = y + radius/2;
      drawCircle(nx, ny, radius/2, level);
    }
  }
}