Two classic books by Douglas R Hofstadter Gödel, Escher, Bach: An Eternal Golden Braid and Metamagical Themas Both are heavy reads. But I would rec

Two classic books by Douglas R Hofstadter Gödel, Escher, Bach: An Eternal Golden Braid and Metamagical Themas Both are heavy reads. But I would recommend looking at Wiki article before buying, available used. Just to make sure they fit your style of brain.