Discuss the various images in ‘After Apple Picking’

In some respects, this poem is simply about apple picking. After a hard day of work, the apple farmer completely fatigued but is still unable to escape the mental act of picking apples: he still sees the apples in front of him, still feels the ache in his foot as if he is standing on a ladder, still bemoans the fate of the flawless apples that fall to the ground and must be consigned to the cider press.