Note 96 — Chapter XIII · The Symbolism of Jade
Reading edition
It is recorded of a horn presented to an emperor of the Tʼang Dynasty that “at night it emitted light so that a space of a hundred paces was illuminated. Manifold silk wrappers laid around it could not hide its luminous power. The emperor ordered it to be cut into slices and worked up into a girdle; and whenever he went out on a hunting expedition, he saved candle light at night.” With the aid of the horn it was possible “to see supernatural monsters in water”.96