To get to the next page, use your finger, mouse or PgDn button. FYI, you are not using Opera Reader. It can be downloaded from the menu on the left! Around 2000 years ago, the Romans developed the codex. Different from scrolls – the previously accepted literary format – the codex had pages that were bound together into what we today call books. Image by Friar's Balsam. The codex gradually replaced