Block-books were a very popular form of (short) book, where a page with both pictures and text was cut as a single woodcut. They were much cheaper than manuscript books, and were mostly produced in the Netherlands; the "Art of Dying" (Ars moriendi) was the most famous; thirteen different sets of blocks are known. As a relief technique (see printmaking) woodcut can be printed easily together with movable type, and after this invention arrived in Europe about 1450 printers quickly came to include woodcuts in their books. Some book owners also pasted prints into prayer books in particular. Playing cards were another notable use of prints, and French versions are the basis of the traditional sets still in use today.