The source text is an excerpt from Douglas Hofstadter's book Gödel, Escher, Bach. The excerpt explores the concept of self-reference and how it manifests in various domains such as mathematics, music, art, and computer science. It delves into Gödel's incompleteness theorem, Escher's recursive artwork, and Bach's musical canons, all of which exemplify the idea of systems that refer to themselves. Hofstadter uses these examples to argue for the interconnectedness of these disciplines and to illuminate the nature of intelligence and its underlying structure.

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