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If you're going to carry around one book when hitchhiking through the known universe (and probably in the unknown parts too), one good choice is Goedel, Escher, Bach: an Eternal Golden Braid by Douglas R. Hofstadter. It is a great book that takes the reader through a lot of interesting ideas and brings new light on many things. The lifetime creations of Goedel, Escher, and Bach are the string through the book. And there are a number of dialogues with the characters of Achilles, the Tortoise, and some of their friends. This must be a hitchhiker's first choice of book for killing time (and small furry creatures) in spaceports. To describe the book is not a easy task. I will just mention some of the things that are discussed and explained in it, and hopefully you will get the hang of it. * Artificial Intelligence and philosophical ideas * Many pictures by M. C. Escher and the techniques behind them * Computer models and the Babbage Engine * DNA-structures and biochemistry * Harmony and fractals * Formal logic and (in)computability * ZEN and a lot of Koans * Pattern recognition and perceptions * Cosmic views and the continuum hypothesis * Description of Turing and his problem * Randomness and set theory * Cognitive science * And of course, musical themes by Bach and how to interpret them All these things, and a lot more, are weaved together to a very interesting and quite heavy book. It's a sure bet if you want something to read again and again. It will make all the years waiting for a spaceship seem like a short passage of time (and space). This book is entitled to: :-) :-) :-) :-) :-) (5 Smileys, in a scale from one to five.)