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GEB is a singularity of very cool ideas. Some of the topics explored: artificial intelligence, cognitive science, mathematics, programming, consciousness, zen, philosophy, linguistics, neuroscience, genetics, physics, music, art, logic, infinity, paradox, self-similarity. Metamathematics. Metathinking. Meta-everything. The author said he was trying to make the point that consciousness was recursive, a kind of mental fractal. Your mind will certainly feel that way when you are done. This is not a dry discussion of these topics. The author recognizes that he's exploring things that are intrinsically fascinating and fun, and has fun with them the whole way through. He doesn't just discuss the ideas, he demonstrates them, sometimes while he's discussing them, in clever and subtle ways. Inbetween chapters, he switches to a dialogue format between fantasy characters; here he plays with the ideas being discussed, and performs postmodern literary experiments. For example, one of his dialogues makes sense read both forwards and backwards. In another, the characters jump into a book, and then jump deeper into a book that was in the book. In yet another, a programmer calmly explains the function and output of a chatbot while the chatbot calmly explains the function and output of the programmer. I find the author's sense of humor in these delightful. In a word, it's brilliant. GEB combines the playful spirit of Lewis Carroll, the labyrinthine madness of Borges, the structural perfectionism of Joyce, the elegant beauty of mathematics, and the quintessential fascination of mind, all under one roof. It's become something of a cult phenomenon, and it has its own subreddit, r/GEB, and even its own MIT course. Does the book succeed in its goal? One of the common criticisms is that the author never gets to the point and proves his thesis, and instead spends time on endlessly swirling diversions. But I don't blame him; the task of connecting mind to math is insanely speculative territory. All he can do is spiral the topic and view it from every conceivable direction. He decided to take a loopy approach to a loopy idea, and I think that's very fitting. If you want a more linear approach to the same idea, you could read I Am A Strange Loop. However, the way GEB weaves a tapestry of interrelated ideas, rather than focusing on just one, is a major part of its charm. In the grand line of reductionism, where we in theory reduce consciousness to cognitive science to neuroscience to biology to chemistry to physics to math to metamath, GEB positions itself at the wraparound point at unsigned infinity, where the opposite ends of the spectrum meet. It is an utter gem, a classic, and a pleasure to read. I cannot recommend it enough.