Kai Tsi

The kai tsi is the justice unicorn of East Asian tradition — an animal, the old Japanese encyclopedia says, of foreign countries, resembling a lion with a single horn, and also called the sin you, the divine sheep. Its defining power is moral: it distinguishes right from wrong. The exemplary story attaches it to the ancient judge Kau You, who, when a case was doubtful, handed the accused over to the beast — and it destroyed the guilty and spared the innocent, a verdict delivered by mauling.

The figure is one member of a small family of such beasts that the Chinese sources enumerate alongside the better-known ki-lin. The hiai chai of the Chinese texts is described as a deer-and-unicorn hybrid that attacks evil people on sight, goring them with its horn; the chiai tung, the spiritual lamb, one-horned and hairy-headed, was brought out by judges at a legal impasse to gore the party in the wrong. The census gathers these under one entry because the compendia themselves treat the names — kai tsi, kai tsu, sin you, hiai chai, chiai tung — as tellings of one idea passed between China and Japan: the animal whose perception is a verdict.

The justice beast sits at a suggestive angle to the gentle ki-lin, whose holiness is shown by harming nothing; the kai tsi's holiness is shown by harming exactly the right party. Later tradition kept the creature close to the law — its image became associated with censors and magistrates — and the compendia's spelling chaos is itself evidence of how widely the idea traveled and how little its function changed in transit.

The paragraphs below are extrapolated; no source supports them.

The kai tsi reads as conscience with a body — a creature whose entire inner life is the perception of guilt and whose only act is sentencing. That suggests a temperament of absolute certainty without cruelty: it does not interrogate, deliberate, or enjoy; it knows and strikes, and its sparing of the innocent is as unhesitating as its goring of the guilty. Incorruptible, humorless, and serene — the personality of a verdict. Read from its function in the stories, and marked as speculation.