"One of the special delights of my childhood was to go and see the cases of illuminated manuscripts in the British Museum, and to walk, as every child can, right into their pages--losing myself in an enchanted world of gold, landscapes and skies whose colours were indwelt with light as if their sun shone not above but in them. Most marvelous of all were the many manuscripts mysteriously entitled "Book of Hours", since I did not know how one kept hours in a book. Their title-pages and richly ornamented initials showed scenes of times and seasons--ploughing in springtime, formal gardens bright in summer with heraldic roses, autumn harvesting, and logging in winter snow under clear, cold skies seen through a filigree screen of black trees. I could only assume that these books were some ancient device for marking the passage of time and they associated themselves in my mind with sundials in old country yards upon hot afternoons, with the whirring and booming of clocks in towers, with astrolabes engraved with the mysterious signs of the Zodiac, and-above all-with the slow, cyclic sweep of the sun, moon and stars over my head."