Page header running header or running headline, is a header that appears on each standard page. Running heads do not usually appear on display pages such as title pages, or on other front or back matter. Running heads in a book typically consist of the title on the left-hand (verso) page, and the chapter title on the right-hand (recto) page; or the chapter title on the verso and subsection title/subhead on the recto, aiding the reader's navigation by showing what content exists within the two-page spread at hand. A special case of the latter is in dictionaries, whose running heads are called
Book test word "day" on the left page, while an antonym version puts "night" there instead. Flashback variations are often incorporated in gimmick books supporting other methods as well. The "Page, Line and Word" trick uses two or three spectators, handing one a book (the "reader"), another an envelope, and the third pencil and paper (the "writer"). The writer is asked to "imagine" opening the book and selecting a word at random, and then writes down the page, line and word number they imagined. The magician then palms the writer's slip and hands a prepared slip to the reader, who opens the