The National Library of Wales has ghosts - but not the scary kind. These ghosts are images, seen only by using ultraviolet lighting, in the 750-year-old Black Book of Carmarthen, "the first Welsh text to include medieval figures such as King Arthur and Merlin," and the images are doodles and poetry added throughout the ages. (photos)
Prof Paul Russell, from the University of Cambridge, who has been uncovering the book's secrets, said: "That tradition of adding to it over the years was carried on by subsequent owners, it was a living text that was constantly added to." Subsequent owners decided to erase the additions, leaving them only visiual by UL light. Among the new material discovered was a drawing of a fish and a medieval poem not seen for centuries.