 For instance, if the word "day" appears as the first word on the left page, a straight flashback would put the 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").