It emphasizes that the protagonist has come full circle or has fundamentally changed.
While the structure is symmetrical, the character shouldn't be. The power of the arch is seeing a similar situation handled by a changed person. arch piece script
Use recurring objects, lines of dialogue, or locations to make the "mirroring" obvious to the audience. It emphasizes that the protagonist has come full
If you were writing a short arch script about a , it might look like this: lines of dialogue