Lets look at the reading experience on the app itself, no matter what book type you open all text is rendered on a old type paper background called Sepia. (goodereader.com)
Related sites Abstract of Science Express paper Background on gravitational lenses Very Large Array Coevolution of black holes and galaxies (conference proceedings) (sciencemag.org)
With its beautiful, minimal, printed kraft paper background; your guests wont be able to contain their excitement at the site of this super trendy invitation. (basicinvite.com)