We keep the wall between us as we go.
The central metaphor in this poem is the wall itself. It comes to represent the divisions between people, things that keep them apart. The speaker notes that he actually doesn't see a need for the division; his neighbor has pine trees, and he himself has apple trees, so it isn't like the wall is accomplishing a real function as it would if they both had cows, for instance. When he asks his neighbor why they have to stand divided, his neighbor answers vaguely: "Good fences make good neighbours." The speaker can't see the practicality in this statement. Therefore, the barriers we construct to divide us from other people are sometimes erected based on things we've heard before but have no practical application.
He is all pine and I am apple orchard.
The pines and apple trees are metaphors for their differences. Pine trees often symbolize longevity; he uses them as a metaphor here to explain how his neighbor carries the traditions of his father: "He will...
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