A document of more than two pages will normally be viewed on screen as a series of double-page spreads. When a multi-page document is printed, however, the pages will be arranged on a larger sheet to be cut and folded into sections. A page has two sides; a single fold creates four sides; fold again and you have eight sides; and so on. Printers’ sections are, therefore, made up of four. The commonest section size is sixteen pages, with either pages printed on each side, although some web offset litho presses can print larger sections. The planning of this process is called imposition.