16. A non-transitory computer-readable medium having instructions stored thereon that, if executed by a mobile device, cause the mobile device to perform functions comprising: performing a optical capture from a book; identifying the book from the optical capture, by at least: identifying a text fragment within the optical capture, and locating a position in the book containing the identified text fragment; retrieving a media sequence associated with the book; and presenting the retrieved media sequence by at least presenting the retrieved media sequence at a time in the time-indexed media sequence that corresponds to the located position in the book.
16. A non-transitory computer-readable medium having instructions stored thereon that, if executed by a mobile device, cause the mobile device to perform functions comprising: performing a optical capture from a book; identifying the book from the optical capture, by at least: identifying a text fragment within the optical capture, and locating a position in the book containing the identified text fragment; retrieving a media sequence associated with the book; and presenting the retrieved media sequence by at least presenting the retrieved media sequence at a time in the time-indexed media sequence that corresponds to the located position in the book. 18. The non-transitory computer-readable medium of claim 16 , wherein the retrieved media sequence was created after the book was produced.