Earth has been destroyed by war and no one lives on it anymore. The robots and the machines continue to function and serve human beings who have long ago died.
What Is Great About It: The title is taken from a poem that describes how nature will continue its work long after humanity is gone. But in this story, we see that nature plays a supporting role and the machines are the ones who have taken its place.
They continue their work without any human or natural assistance. This shows how technology has replaced nature in our lives and how it can both destroy us and carry on without humanity itself.