It's been well-thumbed, at least triple-read, there's that smell the fat orange-spine Penguins get when their pages have yellowed and the book bulges, basically the smell of complex humanity, sort of sweat and salt and endeavour. Like all the fat orange Penguins, it gets fatter with reading, which it should, because in a way the more you read it the bigger your own experience of the world gets, the fatter your soul.
