def METHOD_NAME(self):
    """Prompt the environment to change."""
    current_state = max(self.infos(type=State), key=attrgetter("id"))
    current_contents = float(current_state.contents)
    new_contents = 1 - current_contents
    info_out = State(origin=self, contents=new_contents)
    Transformation(info_in=current_state, info_out=info_out)