One decade is covered by each of the ten volumes in The Edinburgh History of Twentieth-Century Literature in Britain series. Individual volumes may argue that theirs is the decade of the century. The series as a whole considers the twentieth century as the century of decades. All eras are changeful, but the pace of change has itself steadily accelerated throughout modern history, and never more swiftly than under the pressures of political crises and of new technologies and media in the twentieth century. Ideas, styles, and outlooks came into dominance, and were then displaced, in more and more rapid succession, characterising ever-briefer periods, sharply separated from predecessors and successors.

Time-spans appropriate to literary or cultural history shortened correspondingly, and on account not only of change itself, but its effect on perception. How distant, for example, that tranquil, sunlit, Edwardian decade already seemed, even ten years later, after the First World War, at the start of the twenties. And how essential, too, to the self-definition of that restless decade, and later ones, that the years from 1900–1910 should seem tranquil and sunlit – as a convenient contrast, not necessarily based altogether firmly on ways the Edwardians may have thought of themselves. A need to secure the past in this way – for clarity and definition, in changeful times – encourages views of earlier decades almost as a hand of familiar, well-differentiated cards, dealt out, one by one, by prior times to the present one.