Interesting and cool:
As part of their recent relaunch, Pelican Books—the non-fiction arm of Penguin Books, which originally ran from 1937 to 1984—wanted to make covers just as important for e-books as they are for physical books. Their solution was to make the cover a recurring element throughout a text: the central thematic element that ties together a volume’s design, whether physical or digital.
Check out the whole thing here: http://www.fastcodesign.com/3038698/how-pelican-books-is-reimagining-the-cover-in-the-age-of-e-books
