It may be impossible to convey to people who weren’t percipient in the early nineteen-sixties the profound, exulting shock that Robert Frank’s “The Americans” delivered to me, among many others, at the time of its release. The book, which was published in the United States in 1959, ranked with Dylan, Warhol, and Motown as a revelation something like a celestial visitation and something like being knocked off a cliff into a free fall so giddy as to obviate any fret about hard landings. The toughest part, from today’s perspective, was that the impact of Frank’s pictures had only passingly to do with their social, political, and otherwise thematic content, now so serviceable to this or that mode of critique. We were formalists then, and anti-formalists—not alternatively but both at once. Frank had exalted photographic form by shattering it against the stone of the wonderful and (oh, yeah) horrible real.