There is a moment early on in Ray Bradbury’s Fahrenheit 451 (1953) – think of it as the novel’s opening gambit, the disturbance which sets its plot in motion – when the impish Clarisse McClellan attempts to rouse the book’s stolid and otherwise self-possessed protagonist, Guy Montag, from the partial oblivion in which he lives his life. She shadows him on his walk home from work one evening, verbally prodding him in the hope of puncturing what is evidently less a form of sincere conviction than it is a state of unthinkingness. After Montag rebuffs her questions one time too many, Clarisse finally complains, ‘You never stop to think what I’ve asked you.’