"There where it is we do not need the wall:
He is all pine and I am apple orchard...."
See in text (Mending Wall)
The narrator reveals the poem’s central irony: on a practical level, the wall is useless. The purpose of walls between farms is to prevent livestock from crossing over. As the narrator notes, “he is all pine and I am apple orchard.” It becomes increasingly clear that the wall serves a social, rather than physical, purpose.