"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."