In 1964, just as the Beatles were launching their invasion of America’s airwaves, Marshall McLuhan published Understanding Media: The Extensions of Man and transformed himself from an obscure academic into a star. Oracular, gnomic, and mind-bending, the book was a perfect product of the sixties, that now-distant decade of acid trips and moon shots, inner and outer voyaging. Understanding Media was at heart a prophecy, and what it prophesied was the dissolution of the linear mind.