"Once digitized, a page of words loses its fixity. It can change every time it’s refreshed on a screen. A book page turns into something like a Web page, able to be revised endlessly after its initial uploading. There’s no technological constraint on perpetual editing, and the cost of altering digital text is basically zero. As electronic books push paper ones aside, movable type seems fated to be replaced by movable text."

Books That Are Never Done Being Written” (Nicholas Carr, The Wall Street Journal)
See also: “Humans Have the Need to Read