code: protected Control cloneControl(Control control, Spatial spatial) {
          if (control instanceof Sensor) {
              Sensor sensor = (Sensor) control;
              sensor.setId(id);
  
              sensor.listeners.addAll(listeners);
          }
          return control;
      }
docs: /*protected void notifyListeners(SensorData sourceData) {
  for (SensorListener sl : listeners) {
  sl.update(this, sourceData);
  }
  }