void crearCirculos() {

  int numCirculos = 10;
  int radius = 30;

  float theta = TWO_PI / numCirculos;

  pushMatrix();

  for( int i = 0; i<numCirculos; i++ ) {

    int posX = int(radius * cos(i*theta));
    int posY = int(radius * sin(i*theta));

    pushMatrix();
      translate( posX, posY);
      ellipse(0,0,10,10);
    popMatrix();
  }

  popMatrix();

}