A Good Metaphor Crosses Borders Without Papers

I tested two metaphors for the same feeling, desperation with a deadline attached, on a reading group in Algiers and another in Marseille, and only one of them made both rooms go quiet at the same line.

The first metaphor compared a character's waiting to standing in a field the month before harvest, hunger measured against a specific, countable number of days. Both rooms understood it instantly, because both rooms have bodies that get hungry and calendars that count down to something. The second metaphor compared the same waiting to the last day to file a tax return, a reference that landed in Marseille and produced blank faces in Algiers, where the specific bureaucratic dread of a filing deadline is not shared cultural weather the way it is in France. The image was not worse. It simply required a passport the Algiers room did not have, and nobody in a novel has time to stop and explain a metaphor before the sentence after it arrives.

The customs test

Before I trust a metaphor to travel between the readerships I actually write for, I run what I call the customs test: does this image depend on something every reader's body has already experienced, hunger, thirst, weight, distance, heat, or does it depend on a reference that only some readers have already stored, a specific institution, a brand, a public figure, a national ritual. Images built from the first category clear customs without inspection. A reader anywhere has been hungry, has waited, has carried something heavy too far. Images built from the second category get stopped at the border every time, and the sentence has to either pay a toll, a clause of explanation, or lose the reader who does not recognise the reference.

The tax deadline metaphor is not a bad image. It is a precise one, built from real cultural knowledge, and it would do exactly the work I wanted it to do for a French readership who has filed a return under pressure. What it cannot do is what a metaphor is supposed to do for free: land instantly, without a passport check, on any reader who happens to be holding the book. The harvest metaphor does that because hunger and a calendar are older than any specific tax code and belong to nobody in particular.

Why this matters more for a writer working across readerships

A writer publishing to a single, culturally uniform readership can use border-specific metaphors freely, because the whole readership is standing on the same side of that particular border already. I do not have that luxury, because my French readers and my Algerian readers do not share every reference, only some of them, and a metaphor that requires a passport neither side reliably holds will strand one or the other every time I use it. The customs test is how I decide, scene by scene, whether an image is doing universal work or local work, and whether the local work is worth the toll of explaining it.

The case against this

The case against the customs test is that culturally specific images are often the whole point of a scene, not an obstacle to clear before the real meaning arrives. A metaphor built on a shared, local, unexplained reference tells a reader they are inside something, part of an audience the writer trusted to already know, and diluting every image down to hunger and distance in the name of universal passage empties fiction of exactly the specificity that makes a place feel real rather than generic. I take this seriously, because a book made entirely of border-clearing images reads like it was written for an airport, not for anyone in particular.

So I do not apply the test everywhere. I apply it to the images doing structural work, the ones a scene's meaning actually depends on, and let the decorative, texture-building details stay as local and untranslated as they want to be. A character's kitchen can be full of specific brands and specific songs nobody outside Algiers will recognise, because that furniture is doing atmosphere, not argument. The metaphor carrying the chapter's actual emotional weight is the one that has to clear customs, because that is the one sentence I cannot afford to lose half my readers on.