An electronic book does not join itself to other books end to end, as printed books do when we set them on a shelf. Instead, the electronic book can merge into a larger textual structure at a thousand points of contact; it can dissolve into constituent elements that are constantly redefining their relationships to elements in other books.

Jay David Bolter
Bryce Wilner

Bolter, Jay David, Writing Space: The Computer, Hypertext, and the History of Writing (Hillsdale: Lawrence Erlbaum Associates, Inc., 1991), p. 87.