''Gödel, Escher, Bach: an Eternal Golden Braid'', also known as ''GEB'', is a 1979 book by Douglas Hofstadter. By exploring common themes in the lives and works of logician Kurt Gödel, artist M. C. Escher, and composer Johann Sebastian Bach, the book expounds concepts fundamental to mathematics, symmetry, and intelligence. Through short stories, illustrations, and analysis, the book discusses how systems can acquire meaningful context despite being made of "meaningless" elements. It also discusses self-reference and formal rules, isomorphism, what it means to communicate, how knowledge can be represented and stored, the methods and limitations of symbolic representation, and even the fundamental notion of "meaning" itself. In response to confusion over the book's theme, Hofstadter emphasized that ''Gödel, Escher, Bach'' is not about the relationships of mathematics, art, and music—but rather about how cognition emerges from hidden neurological mechanisms. One point in the book presents an analogy about how individual neurons in the brain coordinate to create a unified sense of a coherent mind by comparing it to the social organization displayed in a colony of ants. The tagline "a metaphorical fugue on minds and machines in the spirit of Lewis Carroll" was used by the publisher to describe the book.


''Gödel, Escher, Bach'' takes the form of interweaving narratives. The main chapters alternate with dialogues between imaginary characters, usually Achilles and the tortoise, first used by Zeno of Elea and later by Lewis Carroll in "What the Tortoise Said to Achilles". These origins are related in the first two dialogues, and later ones introduce new characters such as the Crab. These narratives frequently dip into self-reference and metafiction. Word play also features prominently in the work. Puns are occasionally used to connect ideas, such as "the Magnificrab, Indeed" with Bach's ''Magnificat in D''; "SHRDLU, Toy of Man's Designing" with Bach's ''Jesu, Joy of Man's Desiring''; and "Typographical Number Theory", or "TNT", which inevitably reacts explosively when it attempts to make statements about itself. One dialogue contains a story about a genie (from the Arabic "Djinn") and various "tonics" (of both the liquid and musical varieties), which is titled "Djinn and Tonic". One dialogue 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. The conversation still makes sense due to uses of common phrases that can be used as either greetings or farewells ("Good day") and the positioning of lines that double as an answer to a question in the next line. Another is a sloth canon, where one character repeats the lines of another, but slower and negated.


The book contains many instances of recursion and self-reference, where objects and ideas speak about or refer back to themselves. One is Quining, a term Hofstadter invented in homage to Willard Van Orman Quine, referring to programs that produce their own source code. Another is the presence of a fictional author in the index, Egbert B. Gebstadter, a man with initials E, G, and B and a surname that partially matches Hofstadter. A phonograph dubbed "Record Player X" destroys itself by playing a record titled ''I Cannot Be Played on Record Player X'' (an analogy to Gödel's incompleteness theorems), an examination of canon form in music, and a discussion of Escher's lithograph of two hands drawing each other. To describe such self-referencing objects, Hofstadter coins the term "strange loop"—a concept he examines in more depth in his follow-up book ''I Am a Strange Loop''. To escape many of the logical contradictions brought about by these self-referencing objects, Hofstadter discusses Zen koans. He attempts to show readers how to perceive reality outside their own experience and embrace such paradoxical questions by rejecting the premise—a strategy also called "unasking". Elements of computer science such as call stacks are also discussed in ''Gödel, Escher, Bach'', as one dialogue describes the adventures of Achilles and the Tortoise as they make use of "pushing potion" and "popping tonic" involving entering and leaving different layers of reality. Subsequent sections discuss the basic tenets of logic, self-referring statements, ("typeless") systems, and even programming. Hofstadter further creates BlooP and FlooP, two simple programming languages, to illustrate his point.


The book is filled with puzzles, including Hofstadter's famous MU puzzle. Another example can be found in the chapter titled ''Contracrostipunctus'', which combines the words ''acrostic'' and ''contrapunctus'' (counterpoint). In this dialogue between Achilles and the Tortoise, the author hints that there is a contrapunctal acrostic in the chapter that refers both to the author (Hofstadter) and Bach. This can be spelled out by taking the first word of each paragraph, to reveal: Hofstadter's Contracrostipunctus Acrostically Backwards Spells 'J. S. Bach'. The second acrostic is found by taking the first letters of the words (shown in bold), and reading them backwards to get "J S Bach" – just as the acrostic sentence self-referentially claims.

Reception and impact

''Gödel, Escher, Bach'' won the Pulitzer Prize for general non-fiction and the National Book Award for Science."National Book Awards – 1980"
National Book Foundation. Retrieved 2012-03-07.
This was the award for hardcover Science. From 1980 to 1983, the National Book Award history gave separate awards to hardcover and paperback books in many categories, including several nonfiction subcategories. Most paperback award-winners were reprints of earlier works; the 1980 Science was eligible for both awards as a new book. Martin Gardner's July 1979 column in ''Scientific American'' stated, "Every few decades, an unknown author brings out a book of such depth, clarity, range, wit, beauty and originality that it is recognized at once as a major literary event." For Summer 2007, the Massachusetts Institute of Technology created an online course for high school students built around the book. In its February 19, 2010 investigative summary on the 2001 anthrax attacks, the Federal Bureau of Investigation suggested that Bruce Edwards Ivins was inspired by the book to hide secret codes based upon nucleotide sequences in the anthrax-laced letters he allegedly sent in September and October 2001, using bold letters, as suggested on page 404 of the book. It was also suggested that he attempted to hide the book from investigators by throwing it in the trash. In 2019, British mathematician Marcus du Sautoy curated a series of events at London's Barbican Centre to celebrate the book's fortieth anniversary.


Hofstadter claims the idea of translating his book "never crossed ismind" when he was writing it—but when his publisher brought it up, he was "very excited about seeing hebook in other languages, especially… French." He knew, however, that "there were a million issues to consider" when translating,. since the book relies not only on word-play, but on "structural puns" as well—writing where the form and content of the work mirror each other (such as the "Crab canon" dialogue, which reads almost exactly the same forwards as backwards). Hofstadter gives an example of translation trouble in the paragraph "Mr. Tortoise, Meet Madame Tortue", saying translators "instantly ran headlong into the conflict between the feminine gender of the French noun ''tortue'' and the masculinity of my character, the Tortoise." Hofstadter agreed to the translators' suggestions of naming the French character ''Madame Tortue'', and the Italian version ''Signorina Tartaruga''.. Because of other troubles translators might have retaining meaning, Hofstadter "painstakingly went through every sentence of ''Gödel, Escher, Bach'', annotating a copy for translators into any language that might be targeted." Translation also gave Hofstadter a way to add new meaning and puns. For instance, in Chinese, the subtitle is not a translation of ''an Eternal Golden Braid'', but a seemingly unrelated phrase ''Jí Yì Bì'' (集异璧, literally "collection of exotic jades"), which is homophonic to ''GEB'' in Chinese. Some material regarding this interplay is in Hofstadter's later book, ''Le Ton beau de Marot'', which is mainly about translation.



See also

* Chinese room * Church–Turing thesis * Collatz conjecture * Fractal * Heterarchy * Indra's net * Isomorphism * John Lucas (philosopher) * Meta * Mind–body problem * Neural correlates of consciousness



External links

Video lectures from a summer GEB seminar for high schoolers
MIT OpenCourseWare
Partial contents of 20th Anniversary Edition

Mårten's GEB site

Gödel, Escher, Bach (PDF)
{{DEFAULTSORT:Godel, Escher, Bach Category:1979 non-fiction books Category:Basic Books books Category:Books by Douglas Hofstadter Category:Cognitive science literature Category:Cultural depictions of Johann Sebastian Bach Category:Dialogues Category:English-language books Category:M. C. Escher Category:Mathematics books Category:National Book Award-winning works Category:Philosophy books Category:Pulitzer Prize for General Non-Fiction-winning works Category:Puzzle books