Although we rarely dream of boundaries per se, we often encounter uncrossable fences, immovable gates, and other non-traversable obstacles. A Freudian approach would be to discern what might be gained by overcoming the barrier and then attempting to associate that gain with a taboo event. If you have any helpers to get you over, through, or under your obstacle, they may be co-conspirators in the violation-or, your joint conquest of the obstacle may be the taboo in itself.
Depending on whether the taboo is anger, sex, or another violation, you may need to look closely at your feelings about what is on the other side of the fence, across the river, or whatever the obstacle is.
It can be an eerie feeling to encounter a boundary where either you feel unable to go past or your dream companions keep reminding you that nobody goes over there. It may be that the perceived threat or inability to cross the boundary is the central message of the dream.
Perhaps you see yourself as needing to move through a transition into a new self-awareness. In this case, the boundary may reveal what is hindering you. This is especially true if you are traveling too heavily to cross a river, or have companions who will not cross with you. If you have dream companions helping you with whatever boundary you face, it may be worth heeding their dream advice. Often times, we feel that a fence must be crossed when in fact the protection they provide is important.
While boundaries may feel constricting at times, the psychological pain of attempting to cross every boundary in life can cause great problems that could have been avoided by knowing when to stop.