I lived with a bunch of engineering students my freshman and sophomore years. At some point, everybody got a copy of this and was reading it. It’s an interesting melange of math, music and art. If you like word puzzles, and recursions and illusions, Zen koans and a dose of philosophy, it entertains. My friends all became programmers and physicists, and I went into journalism, a practical art. We all took something different away from this, I suspect — in my case, a lasting interest in koans and Zen Buddhism. My wife picked this up the other day because one of her students is reading it, but after seeing the formulas and technical material, she put it back on the shelf. It can be tough reading, but it rewards you by stretching the brain.