Physical and mental boundaries are explored throughout the poem ‘Mending Wall’ by Robert Frost. A sarcastic tone is reflected throughout the poem as the persona isn’t exactly sure why they are building the wall;

‘There where it is we do not need a wall:
He is all pine and I’m apple orchard.
My apple trees will never get across
And eat the cones under his pines, I tell him.’

The persona tries to explain to his neighbour that a wall is not necessary, ‘Good fences make good neighbours’, is all he gets in return. The persona doesn’t want to argue, so, he goes ahead and helps to build the wall, he knows it is a waste of time…