According to Hofstadter what is the theme of the book Gödel, Escher, Bach?

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.[1][2]

According to Hofstadter, the main theme of Gödel, Escher, Bach is how cognition emerges from hidden neurological mechanisms.