…ce at about the same time as the transition from manuscript rolls to paged books. As the advent of printing made it more convenient to produce and use books in the form of pages, so was it easier to produce cards. These 'sheet-dice,' as they were called, began to appear according to Ou-yang Hsiu (1007-72) before the end of the Tang dynasty, and if this is true, they were one of the earliest forms of block printing in China, as they were in the West" (Carter, Invention of Printing in China …