Entertainment has been a very old business. Entertainment also includes books, but they create a space enough also for other things: like Art.
My father always exclaims that books aren't valuable. On the note, the books he mentioned helped me develop my writer skills. On every page of a book I read, I can feel the knowledge rushing to my brain.
A book is the sign of education. Often placed with a torch, it symbolizes enlightenment. My 300-book shelf has enlightened me. Are you enlightened?