cell X;

void setup() {
  size(600, 600);
  noStroke();
  background(255);
  ellipseMode(CENTER_DIAMETER);
  framerate(40);
  cursor(CROSS);
  smooth();

  X = new cell(1,width/2,height/2, width);              //FirstCell
}

void loop() {
  //background(255);
  fill(255,20);
  rect(0,0,width,height);
  for(int i=0; i<1; i++)  X.drawCell();                //DrawMany Cells per Loop
}

                                                        //This is the only object. It's used with recursivity.
class cell{

  int actualCell;                                       //the parent control the state of his children
  int posX, posY;                                       //the center of the block
  int max;                                              //the width of the block (just max is ok as they're square)
  cell[] grid;                                          //the array of children (won't use 2D array)

  cell(int sub, int posX, int posY, int max){
    this.posX = posX;
    this.posY = posY;
    this.max = max;

    if(sub>1) divideCell(sub);
    else grid = new cell[1];

    actualCell = 0;
  }

  boolean drawCell(){
    boolean tst = false;
    if(grid.length==1)
    {
      drawBlock();
      accidentalCell();
      tst = true;
    }
    else {
      if(grid[actualCell].drawCell() )
        if(inc() ) tst = true;
    }
    return tst;
  }

  void drawBlock(){
    fill(0);
    ellipse(posX, posY,0.95*max,0.95*max);
    fill(255);
    ellipse(posX, posY,0.85*max,0.85*max);
    fill(0);
    ellipse(posX, posY,0.28*max,0.28*max);
    fill(255);
    ellipse(posX, posY,0.25*max,0.25*max);
    fill(0);
    ellipse(posX, posY,0.15*max,0.15*max);
  }

  void divideCell(int sub){
    grid = new cell[sub*sub];                           //Create the children's array
    if(sub>1){                                          //If it should divided in more than one cell
      for(int i=0; i95)                                  //It hapen sometimes
    {
      int sub = (int)random(3)+1;                       //Number of divisions
      divideCell(sub);
    }
  }

  boolean inc(){
    boolean tst = false;
    actualCell++;
    if(actualCell>=grid.length)
    {
      actualCell =0;
      tst =true;
    }
    return tst;
  }

}