Once there were two color kittens with green eyes, Brush and Hush.
(Margaret Wise Brown, The Color Kittens)
He thus took delight in the blue and the grey ocean, the beauty of snow clad mountains and of the green lowlands, the magic of the north woods and the grandeur of southern vegetation, the atmosphere of landscapes upon which great historical memories rest, and the peace of untouched nature.
(Freud, ‘The disappointments of war’, in Reflections on War and Death, tr. A. A. Brill & A. B. Kuttner)
Due to increasing research being conducted at ICASE in the field of fluid mechanics, future ICASE reports in this area of research will be printed with a green cover. Applied and numerical mathematics reports will have the familiar blue cover, while computer science reports will have yellow covers.
(note inside ICASE Report No. 93-73)
During the night the wind had blown away all the clouds; the dark blue sky was spreading overhead, and in its midst was the bright sun shining down on the green slopes of the mountain, where the flowers opened their little blue and yellow cups, and looked up to him smiling. Heidi went running hither and thither and shouting with delight, for here were whole patches of delicate red primroses, and there the blue gleam of the lovely gentian, while above them all laughed and nodded the tender-leaved golden cistus.
In 2017, the series takes its most recent step forward. Jim Stoddart has given his own 2007 design a new livery: the back covers, spines, Penguin roundel and cover text have all turned a pale blue-green, a shade known as ‘eau-de-nil’, ‘water of the Nile’. This colour is a reference to the series’ original palette and its brief blue-green incarnation as Twentieth-Century Classics.
The colour ‘eau-de-nil’ emerged in the late 19th century, associated with fashionable décor, clothing and ladies’ toilettes. Over the last hundred years it has become more peppermint, and is widely used by ‘classic’ brands including Fortnum and Mason, Laura Ashley and Hunter wellingtons. It resembles ‘Cambridge blue’.
(Henry Eliot, ‘Designing Penguin Modern Classics (Part 3)’)