Bookended
Bookended is an adjective describing a thing that is framed or bounded by elements at its two ends. It derives from the use of bookends, which support books upright on a shelf. Metaphorically, something is bookended when its beginning and ending are designed to mirror, echo, or relate to each other, creating a sense of closure or symmetry. The phrase can also function as a verb: to bookend.
In literature, film, and other narrative arts, bookending refers to a framing technique in which an opening
In design and media, bookending may describe symmetrical compositions—elements placed at opposite ends of a space
Bookending is related to, but distinct from, ring composition or palindromic structure, which more strictly reiterates