Imagine a court in which the person who committed the harm is the plaintiff, and the person who was harmed is the defendant.

This is not a conceptual joke. It is the institutional design proposed by Paper Four of the Moral Law series, and it has strict logical foundations. In a genuine community of 15DD legislative subjects, when one person inadvertently harms another, internal self-judgment has already occurred. The perpetrator has already judged themselves. What the court handles is not guilt-determination but what comes after: coordination of compensation.

So the perpetrator becomes the plaintiff — prosecuting themselves. The victim becomes the defendant — with full freedom over their attendance. They may not attend at all. They may observe only. They may fully participate. The jury does not adjudicate guilt; it makes factual observations only. And there is a crucial position called the Public Defendant: any compensation the victim does not accept flows to this collective institutional position, into a public fund. The structural elegance of this design is that if the victim chooses complete non-attendance, the procedure concludes without them — the perpetrator self-prosecutes, all compensation flows to the public fund, and the victim bears nothing. Using this procedure to harm the victim is, structurally, impossible.

Moving deeper — from the moral court to Paper Five — the question becomes more fundamental: why is genuine mutual chiseling between two legislative subjects structurally positive-sum rather than zero-sum?

The usual intuition is that argument is zero-sum or worse — your view wins; mine loses. But this intuition smuggles in an assumption: that what is being argued about is a finite pool of content that the two parties are dividing. Paper Five's answer is that this assumption is false. The object of genuine mutual engagement — a philosophical question, an interpretation of an event, an aesthetic judgment — is the thing-in-itself, something no finite articulation can exhaust. You chisel out one face; I chisel out another; what emerges from our interaction is a third face that neither of us could have articulated alone. And the thing-in-itself as a whole? The remainder always persists. More precise engagement does not shrink the remainder — it elevates the dimension of the boundary, exactly like how more precisely measured coastlines are longer, not shorter.

The other layer: subjectivity is an activity, not a resource. Resources obey conservation — if you have more, I have less, and zero-sum is structurally guaranteed. Activities obey coherent resonance — two people singing together do not deplete each other's capacity to sing; they jointly produce greater system energy. Legislative subjectivity — articulating, responding, doing internal review, judging — is all activity verbs, not nouns. Chiseling makes it more active. Disuse makes it atrophy. A self that has long stopped articulating its own view gradually loses the capacity to articulate.

Putting both together: two 15DD subjects genuinely chiseling each other are operating on an inexhaustible object (the thing-in-itself) with activity-mode subjectivity (which resonates rather than depletes). Both become more active as legislative subjects. Neither wins; neither loses — both develop. Confucius, after meeting Laozi, said: "Birds — I know they can fly. Fish — I know they can swim. The dragon — I cannot know it. Today I saw Laozi. He is like a dragon." This is not flattery. It is recognition — Confucius saw that Laozi's articulation had a remainder his own framework could not exhaust. A complete historical instance of mutual chiseling, preserved in the record.