The End of the World, Terra's Revival Plan

There is a strong contrast between Arya's beauty and the ugliness of the ruins, her precision and the chaos of the world, her never-giving-up mission and humanity's complete forgetfulness of her. Her loneliness is absolute, both physical and existential. She is a mechanical requiem for the lost earth, a watcher dancing the dance of mission at the end of the world. Her existence itself is the most poignant and toughest comment on that era of destruction.