多项选择题

How do you understand the meaning of “wall”  in the poem?
A、“Wall” in the poem can refer to the wall-like structures in our life: fences, gates, boundaries, lines, etc.
B、“Wall” is present throughout the poem as an extended metaphor for the division that exists between the speaker and his neighbor.
C、“wall” unites the speaker and his neighbor.
D、“wall” can also serve as a binder of the neighbors.