(Click for a bigger version.)
UPDATE: The infinitely wise John Self explains: "The illustration is by Alice Smith and the design by brackettpress.co.uk. The endpapers are of similar design. It is indeed a beautiful cover, and a beautiful object - matt, dustjacketless hardback, the size of a squarish small paperback - but sadly I couldn't get through the thing at all, even though it's only 120 pages long." Here's the full cover, from Ms Smith's website.