Scribes and bookbinders have long attempted to match the sides of materials forming the leaves of books. The early scribes were concerned with the arrangement of the sides of papyrus, which were different because of the placement of the strips, and therefore the orientation of the fibers, during manufacture. When the number of sheets of papyrus were placed one upon another with each one the same way up, and were then folded down the middle to make a section, the first half of the section had the horizontal lines uppermost, while the second half had the vertical lines uppermost. This method was sometimes adopted, whereas in other cases the sheets were alternated so that horizontal faced horizontal, and vertical faced vertical. In the case of vellum, the practice is to arrange the leaves so that flesh-side faces flesh-side and grain-side faces grain-side, in much the same manner as such papers as azure are faced light side to light side and dark side to dark side. Even modern day book papers have sides, a felt side on the machine-made papers and a wire side on hand-made papers. (94 , 123 , 192 , 236 , 365 )