Though the World Wide Web was invented thirty years after "The Gutenberg Galaxy" was published, McLuhan may have coined and certainly popularized the usage of the term "surfing" to refer to rapid, irregular and multidirectional movement through a heterogeneous body of documents or knowledge, e.g., statements like "Heidegger surf-boards along on the electronic wave as triumphantly as Descartes rode the mechanical wave." Paul Levinson's 1999 book "Digital McLuhan" explores the ways that McLuhan's work can be better understood through the lens of the digital revolution. Later, Bill Stewart's 2007 "Living Internet" website describes how McLuhan's "insights made the concept of a global village, interconnected by an electronic nervous system, part of our popular culture well before it actually happened."