Open book
A book lying open at a specific page — knowledge ready for reading at the place it was left.
An open book in a dream is the dream's image of knowledge ready for reading at the place it was last left. The book is not closed and not put away; the open page is what was being attended to before the reader stepped away. The dream brings the open book when something in your life — a piece of study, a subject you have been with for a long time, a scripture you keep returning to — is in the state of being currently available at the right page. An open book picked up again and continued is the dream affirming the held thread. An open book left long enough for the page to be forgotten and the binding to lose the place, is the dream noting that the thread was being kept and the keeping was abandoned, and the next reader will be opening at the beginning again.