Seeing life as "upside down" becomes the central metaphor for looking at experiences throughout the book.
The reservation, as a place and as a state of mind, is the central metaphor.
He chose as one of his central metaphors the bowel movement.
The idea was that everything was going to serve a central metaphor.
The love story suffers, to borrow its central metaphor, from low motility.
I wondered if this was the central metaphor in Dana's life.
That, I assume, is the central metaphor of the film.
Fishing serves as both primary setting and central metaphor for Mark's struggle.
The central metaphor of the work is the split between inside and out.
Cooking provides the central metaphor for this very political book.