Fangzhongshu

The arts of the bedchamber were classified in China as a branch of medicine, not of ethics and not of religion in the narrow sense. They belong to the wider enterprise the sources call nourishing life, which also covers diet, breathing, gymnastic regimens, drugs and sleep, and which treats the body as something to be managed over a lifetime rather than repaired when it fails.

That placement explains the vocabulary. The texts discuss the handling of qi and of jing, the generative essence, and treat conduct in the bedchamber as one of the ways either can be conserved or squandered. Their concern is duration and vitality. Moral judgement about sexual conduct, which is present in Chinese writing in quantity, is largely absent from this literature, because the literature is not asking that question.

Imperial bibliographies list bedchamber works as a recognised category alongside the other medical divisions, which is how it is known that a substantial body of such writing once existed. Most of it did not survive in China. The Encyclopedia of Taoism and the Daoism Handbook, both edited surveys of the field, set out what the category contained and how it was understood, and the atlas follows them in describing the tradition rather than reproducing any regimen it prescribes.

The transmission history is unusual and it is the main reason the subject can be studied at all. Two routes carried the material past the point where it dropped out of ordinary Chinese circulation.

The first is archaeological. Manuscripts recovered from the Mawangdui tombs in Hunan, sealed in the second century BCE, include bedchamber texts alongside medical, cosmological and philosophical works. Because they were buried rather than copied, they show the tradition at a date long before the compilations that later readers knew, and they were unavailable to every scholar before the excavation.

The second is Japanese. A large medical compendium assembled in Japan in the tenth century preserves a bedchamber section quoting Chinese works that no longer survive independently, which is how the contents of several lost titles are known. Later material also reached the Daoist canon, where it sits among the other technical arts.

The result is a subject reconstructed from a buried cache, a foreign compendium and a religious canon, with the ordinary manuscript tradition largely missing. The atlas records how the sources reached us because the shape of the evidence governs how confidently anything can be said, and because a reader who does not know that the record is fragmentary will read confident modern summaries of it as if they rested on a continuous tradition.