If the figures of history are paraded before the mind’s eye, century by century, once the 1750s are reached one seems suddenly to be looking through a zoom lens. The procession of more-or-less august personages, remote and rather incomprehensible, conventionally portrayed and stiffly posed, and speaking or writing in stilted formulae, is elbowed aside by an animated and colourful crowd, all in close focus. Their faces and their pens are equally lively: here at last are men and women with whom we would like to converse, at whose jokes we could laugh, and with whom it would be our good fortune to become friends.