One embodiment includes a portable e-book reading device for reading a paginated e-book, with at least a page including a section including text linked to an illustration. The device can layout the section by keeping the text with the illustration to be displayed in one screen, and maintaining the pagination of the e-book if the page is displayed in more than one screen. Another embodiment includes a paginated e-book with a text sub file with texts, an illustration sub file with illustrations, and a logic sub file with rules on displaying the e-book. Either the text or the illustration sub file includes position information linking at least an illustration to a corresponding piece of text. Yet another embodiment includes an e-book with a logic sub file that can analyze an attribute of, and provide a response to, a reader.