By keeping a book in one location, you form a relationship between the book, yourself, and the room where you read it. Via Quartz:
By keeping your book in one location each time, you free yourself from the distractions of a commute or the pounding waves of a beach. As a result, a strange new relationship forms, between you, the voice of the book, and the room. Your ritual creates a singular association between the book and a quiet, private place, which in turn gives your relationship a new dimension. Your friend never leaves your room, has never seen you with makeup on, or shoes.