"Through the fathomless deeps of space swims the star turtle Great A’Tuin, bearing on its back the four giant elephants who carry on their shoulders the mass of the Discworld. A tiny sun and moon spin around them, on a complicated orbit to induce seasons, so probably nowhere else in the multiverse is it sometimes necessary for an elephant to cock a leg to allow the sun to go past"
- Terry Pratchett, Wyrd Sisters.
This is the Art of Paul Kidby, who has illustrated not only the covers to a great many discworld books, but also illustrated calendars, art books and the fully illustrated stories like The last hero.
Terry Pratchetts Discworld is easily my favourite fantasy world.