Two Languages, One Ear
My translator Elham once asked why a line of mine, translated correctly into English, sounded wrong to her, and it took us an hour to notice that the English line had five stresses where my ear, without my permission, had wanted four. I do not think in stress counts. I did not know I was counting. But something in me had absorbed a Persian quantitative pattern so completely that it was voting on English sentences that had never agreed to follow its rules.
The usual account of a bilingual writer's ear treats the two languages as separate rooms, one for Persian rhythm and one for English rhythm, with the writer switching lights on and off as she moves between them. This is a tidy model and I no longer believe it describes what actually happens after enough years living inside both. The two systems do not stay in separate rooms. They sit in the same ear, at the same time, and what a bilingual writer actually hears when composing a line is neither language's native meter cleanly. It is a third pattern, produced by both systems listening at once, and that third pattern has its own logic, which belongs to neither language and cannot be predicted from either one alone.
The interference beat
I call this the interference beat, and the term is deliberately borrowed from what happens when two waves of close but unequal frequency meet and produce a third rhythm neither wave contains on its own. Persian classical meter counts quantity, long and short syllables, in a pattern set by the poem's form before a word is chosen. English meter counts stress, not length, and the two systems disagree about which syllables in a shared vocabulary of borrowed words, of which English and Persian share plenty through Arabic and French, actually carry the weight. When I compose in English now, both counting systems run simultaneously and produce a beat that is neither correctly stressed English nor correctly quantified Persian, but a specific, repeatable pattern of its own, the same interference every time, because the two systems generating it have not changed.
The five stress line Elham caught was doing exactly this. An English reader hears it as slightly overloaded, one stress too many for the sentence's actual sense. A Persian reader, reading only the transliteration, hears a quantity pattern that resolves cleanly, a long syllable landing exactly where the form wants it. Neither reader is wrong. Both are hearing a real, coherent pattern, just not the same one, and the line only sounds broken to a reader working from a single system, because a single system cannot detect a beat generated by two.
Using the interference on purpose
Once I could name this, I stopped treating the interference beat as noise to be edited toward one language's rules and started treating it as a real instrument with its own character, available to nobody who holds only one of the two systems. In an English poem now, I will sometimes deliberately load a line with the extra stress my Persian ear wants, not as an error to fix in revision but as a texture no monolingual English poet would produce, because no monolingual English poet is running the second system that makes that particular overload sound inevitable rather than clumsy. This does not work for every line, and I do not use it as a constant style. It is a specific tool for the moments when I want a reader, even one with no Persian at all, to feel that a sentence is being pulled by something they cannot name.
The disagreement worth stating
You could counter that this is simply what an imperfect bilingual ear produces before enough practice smooths it into fluent, native-sounding English, and that what I am calling an instrument is really just an accent that skilled translation should eventually erase rather than cultivate. Elham has made a version of this argument to me directly, and she is right that most of my early English lines were not deploying the interference beat on purpose, they were simply failing to hit either system cleanly, and failure is not the same thing as an instrument. The difference, as far as I can tell after years of watching my own drafts, is intention and repeatability. An accident produces the overload once and never again in a comparable spot. What I am describing now produces the same specific pattern reliably, on demand, in lines built to want it, and a tool you can summon on purpose is no longer the thing it resembled by accident.
Elham kept the five stress line, in the end, once I explained what it was doing, and told me she would flag every future one instead of quietly fixing it. I have made her job harder. I think the lines gained something real from it, though I no longer entirely trust which ear is telling me so.