As he begins to view the familiar as foreign, de Botton puts to use all the tools he has gathered from his traveling companions throughout the book. He speculates about other riders’ lives, much as he speculated about the people Edward Hopper painted; he wonders whether the man on the phone is projecting his own psychological issues onto whomever he is talking with, just as Ruskin and Wordsworth saw travelers diffract their own emotions and virtues through their descriptions of the environment; and he follows his curiosity, tying details to bigger questions, as he learned from Humboldt in Madrid.