On the morning of January 27th—an aeon ago, in tech time—Steve Jobs was to appear at the Yerba Buena Center for the Arts, in downtown San Francisco, to unveil Apple’s new device, the iPad. Although speculation about the device had been intense, few in the audience knew yet what it was called or exactly what it would do, and there was a feeling of expectation in the room worthy of the line outside the grotto at Lourdes. Hundreds of journalists and invited guests, including Al Gore, Yo-Yo Ma, and Robert Iger, the C.E.O. of Disney, milled around the theatre, waiting for Jobs to appear. The sound system had been playing a medley of Bob Dylan songs; it went quiet as the lights came up onstage and Jobs walked out, to the crowd’s applause.