In his essay “The First Steps Toward a History of Reading,” Robert Darnton describes a switch from “intensive” to “extensive” reading that occurred as books began to proliferate. Until relatively recently, people read “intensively,” says Darnton. “They had only a few books – the Bible, an almanac, a devotional work or two – and they read them over and over again, usually aloud and in groups, so that a narrow range of traditional literature became deeply impressed on their consciousness.