Gödel, Escher, Bach
An Eternal Golden Braid
Douglas R. Hofstadter
Douglas Hofstadter's book is concerned directly with the nature of “maps” or links between formal systems. However, according to Hofstadter, the formal system that underlies all mental activity transcends the system that supports it. If life can grow out of the formal chemical substrate of the cell, if consciousness can emerge out of a formal syste...
Over the years, I kept finding myself returning to its insights, and each time I would arrive at them at a deeper level. – source