"Luca wonders if they're moving perpendicular to that boundary now, that place where the fence disappears and the only thing to delineate one country from the next is a line that some random guy drew on a map years and years ago" (chapter 30, page 317). In his 1971 book "Theory of Justice", the philosopher John Rawls came up with what he called the "veil of ignorance." Rawls asked readers to think about how they would design an ideal society if they knew nothing of their own sex, gender, race, nationality, individual tastes, or personal identity.
Do you think the decision-makers of the borders might've made a different decision if they'd donned the veil of ignorance? Do you think borders are a necessary evil or might their delineation serve a societal good? Do you think that the world would be a better place if we all brought Rawls's thought experiment to bear in our everyday individual and collective decision-making?