Gödel, Escher, Bach : Free Download, Borrow, and Streaming : Internet Archive

DeLong and Hofstadter both found great beauty in what the latter called strange loops—occasions when mathematical systems or works of art or pieces of music fold back upon themselves. M. C. Escher’s drawings are a great, overt example of this. Take his famous picture of two hands drawing each other; it’s impossible to say where it starts or ends. W... See more