Answer:
We have to use a spell to make them balance: "Stay where you are until our backs are turned!"
Step-by-step explanation:
Robert Frost's poem "Mending Walls" presents a contradicting life of humanity, with the metaphor of two neighbors mending walls to stay connected and peaceful. This contradiction also refers to society as a whole, with the ironic act of coming together to mend the fence which makes them have a better bond.
The speaker narrates how he and his neighbor had to come together to get the fence mended. But despite the 'barricade' of the fence, it was this necessity of making boundaries that break boundaries. And his amusement can be seen in the lines "We have to use a spell to make them balance: 'Stay where you are until our backs are turned!'"