It symbolizes the difficulty of reaching an end. If cross bars appear along with obstacles, we will have sorrows. If the bars are broken, there are doors at the barrier or something that allows crossing the obstacle is favorable, because we will have means to solve our problems. If the barrier was already formed, the obstacles come from outside. If we built ourselves, problems also are generated by us. If the barrier is demolished, in addition to problems, we are in danger. If we are on the barrier, our effort represents ultimate success.