As grounds either for having children or for having an irreversible vasectomy, these words from Christopher Hitchens have remained with me a long time: “Nothing can make one so happily exhilarated or so frightened” as fatherhood, he wrote. “[I]t’s a solid lesson in the limitations of self to realize that your heart is running around inside someone else’s body.”

Lately, one wonders how the scales are tipped between exhilaration and fright when the body your heart is running around in happens to be playing Pokémon Go.