Стена
Граница — защита или барьер в зависимости от того, по какую сторону вы стоите.
A wall in a dream is the dictionary's image of a boundary. From one side it is protection; from the other it is barrier. The dream often appears at points where you are deciding whether a wall in your life is still serving you, or has become the thing keeping you from what you want.
Where you often see it. A wall at the end of a corridor. A wall with no door. A wall newly built across a path. The dream uses the wall for a boundary — protection or barrier depending on which side of it you stand.
What it is not. A wall is not always negative. The dictionary reads it as the choice of structural enclosure.
Related in the dictionary. Read wall with fence, gate, castle, and any scene where the dreamer's containment is the issue.