Books are three-dimensional objects. They become larger when you read them, as you interact with the book, you change it. Books, in the age of mechanical reproduction, are both copies and originals. Everything I'm saying is probably obvious, but when drawing a frame around reading, it is important to think about it in an intentional way.
When putting a frame around reading, you are in space, and you have entered the realm of dance and performance.
Also, you don't really need to think about it this much, either.