Deliberately empty pages are usually the result of conventions and printing techniques. Chapters traditionally start on an odd page (Front page); If, by chance, the previous chapter has an odd number of pages, an empty page is inserted at the end. Book pages are often printed on large sheets of paper for technical and financial reasons. Thus, a group of 8, 16 or 32 consecutive pages is printed on a single sheet in such a way that, when folding and mechanically cutting the sheet, the pages are in the correct order for binding. This is called equal work and the group of pages is called section or signature. Books printed in this way always have a number of pages that are several times the number in such a signature, for example. B several times of 8, 16 or 32.