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Structure The book takes the form of an interweaving of various narratives. The main chapters alternate with dialogues between imaginary characters, inspired by Lewis Carroll's "What the Tortoise Said to Achilles", which is featured in the book. In this, Achilles and the Tortoise discuss a paradox related to modus ponens. Hofstadter bases the other dialogues on this one, introducing the Crab and a Genie, among others. These narratives frequently dip into self-reference and metafiction. Word play features prominently in the work. Puns are occasionally used to connect ideas: "the Magnificrab, Indeed" (Bach's Magnificat in D), "SHRDLU, Toy of Man's Designing" (Bach's Jesu, Joy of Man's Desiring), and "Typographical Number Theory", which inevitably reacts explosively when it attempts to make statements about itself, thus "TNT". One chapter concerns a genie (the name comes from the arabic "Djiin") who magically manipulates musical structures called "tonics". The chapter is titled "Djiin and Tonic". Another example of the book's word play combines a double pun and a Spoonerism with an analogy, whilst simultaneously expressing the main metaphysical theme of the book: "Is the soul greater than the hum of its parts?" TNT is an illustration of Gödel's incompleteness theorem and further analogies for it occur in the book, for example a phonograph which destroys itself by playing a record entitled "I Cannot Be Played on Record Player X". This is an example of a strange loop, a term coined by Hofstadter to describe things which speak about or refer back to themselves, such as Escher's lithograph of two hands drawing each other. (Cf. recursion and self-reference.) Hofstadter drives readers along many kinds of routes to escape such contradictions stemming from logic. Discussion about Zen koans aims to show us how to perceive reality outside the normal confounds of our own experience and embrace such paradoxical questions by rejecting the premise, termed "unasking", with the answer Mu (無). There are other colorful stories about SHRDLU, the Alternative Structure of the Union, self-engulfing TV screens, and canon form in music. Other topics range from Zeno's paradoxes to sentient ant colonies. A key question asked by the book is, "When are two things the same?" Another paradox, the self-referential Hofstadter's law, made its way into geek culture: It always takes longer than you expect, even when you take into account Hofstadter's Law. Call stacks are also discussed in GEB as one dialog describes the adventures of Achilles and the Tortoise as they make use of "pushing" and "popping" tonics. Entering a picture in a book would count as "pushing", entering a picture in a book within a picture in a book would have caused a double "pushing", and "popping" refers to an exit back to the previous layer of reality. The Tortoise humorously remarks that a friend of his performed a "popping" while in their current state of reality and has never been heard from since. (Did the friend simply cease to exist, or has the friend achieved a higher state of reality, i.e. the same level of reality that the readers of GEB currently reside in?) Subsequent sections discuss the basic tenets of logic, self-referring statements ("typeless"), systems, and even programming. One dialog in the book is written in the form of a crab canon, in which every line before the midpoint corresponds to an identical line past the midpoint, yet the conversation makes sense due to uses of common phrases which can be used as either greetings or farewells ("Good day") and the positioning of lines which, upon close inspection, double as an answer to a question in the next line. One puzzle (in the dialogue Aria with Diverse Variations) is a speculation concerning an author who writes a book and chooses to end the book without actually stopping the text, as is the usual procedure. An author cannot make a sudden ending (sudden from considerations of plot, that is) come as a surprise, when the physical fact that there are only a few pages left in the book is obvious to the reader; so such an author might wrap up the main point, and then continue writing, but drop clues to the reader that the end has already passed, such as wandering and unfocused prose, misstatements, or contradictions. Then, when reading the last parts of that same dialogue — or, some might say, GEB as a whole — peculiarities may be noticed. Also, few readers have noticed that the book begins with a cue to the "Author", possibly a joke about the notion that the entire book is really a long monologue by Hofstadter. Translation The book was for some time considered untranslatable, as it relies heavily on so-called "structural puns", such as the "Crab Canon" dialogue*, which reads almost exactly the same, sentence-for-sentence, both forwards and backwards. Translation has been a complex task, which has resulted in new material and interplay between the translators and Hofstadter. For instance, in Chinese, the subtitle is not a translation of an Eternal Golden Braid, but a seemingly unrelated (and nonsense) phrase Jí Yì Bì (集异璧, literally "collection of exotic jade") which turns out homophonic with GEB. Some material regarding this interplay is to be found in Hofstadter's later book Le Ton beau de Marot, which is mainly about translation. List of alternate-language titles People featured in GEB Fields of study covered in GEB See also | ||||||||||
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