Books have been the subject of interesting and important discourses for philosophers for very long time. Impatient time of us can ignore but can't argue that "A room without a book is a body without a soul" (
Whether or not readers recognize it as such, they all use some kind of personal organizing system to determine which books they choose to read (in other words, to add a given resource to the collection of books that will be read). The very vastness of the collection of available books makes it essential to do so. Along with metadata such as genre, author, price, and library availability, a common method of developing organizing principles for this system is to use description resources (recommendations from friends, editorial reviews, online user reviews).