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He means mental robbery, of course, the sort that all film adaptations of novels commit. He observes, in what's not an original thought but a vital one: "One should watch a film adaptation of a favorite book only after considering, very carefully, the fact that the casting of the film may very well become the permanent casting of the book in one's mind. This is a very real hazard."

This book's midpoint, in fact, is about where you realize that Mendelsund does several things well. He has a wide range of reference, taking core samples from the work of Joyce, Dickens, Nabokov and Woolf, among others, and he quotes with care. This line from Oliver Sacks sums up some of this book's subject matter: "One does not see with the eyes; one sees with the mind."

Mendelsund notes that we can read novels quickly, as if driving through them, or slowly, as if walking, and have distinct experiences. About this he notes, "The best book for me: I drive through it quickly but am forced to stop on occasion, to pull over and marvel."

He can be a canny close reader. He prints a few descriptive sentences of a couple walking together from Wharton's House of Mirth, and mentally X-rays them. "It is helpful that we are told about the shape of this character's hair and the thickness of her lashes," he writes. "But what is truly being communicated to us is a rhythm. The rhythm, in turn, conveys a young man's elation at walking alongside a young woman."

You read this and you think: Yes.

To his credit, Mendelsohn keeps his tone light while thinking deliberately about fundamental things. He moves from a remembered family trip along a river, for example, to a sense that, as he writes, "Words are effective not because of what they carry in them, but for their latent potential to unlock the accumulated experience of the reader."

A gifted designer, Mendelsund is more alert that most to inflection and innuendos. He's the man, after all, who designed the dust jacket for Stieg Larsson's The Girl With the Dragon Tattoo.

His humbleness is another of this book's good qualities. "I am a visual person (so I am told)," he says. "I am a book designer, and my livelihood depends not only on my visual acuity in general, but on my ability to recognize the visual cues and prompts in texts. But when it comes to imagining characters, daffodils, lighthouses, or fog: I am as blind as the next person."