global obj_locations
    obj_locations = { '1': None, '2': None,'3': None }


    # Initialize listner
    robot.world.add_event_handler(cozmo.objects.EvtObjectObserved, object_observed_handler)
    robot.world.add_event_handler(cozmo.objects.EvtObjectDisappeared, object_disappeared_handler)

    while not stopevent.is_set():

        # Init: Is Cube 1 in sight

        pass # Your code


def object_observed_handler(evt, image_box=None, obj=None, pose=None, updated=None, **kwargs):
    print('object:', obj)
    # print('pose:', pose)
    # print('updated:', updated)


def object_disappeared_handler(evt, obj=None, **kwargs):
    print('object disappeared:', obj)