Wood mosaic technology, that is, embedding various textured materials into wood to form various patterns, originated earlier. The technology was very advanced in the Tang Dynasty and was more widely used in the Song Dynasty. At first, the materials used for mosaic patterns were mostly mother-of-pearl, gold and silver, porcelain and marble, and the objects made were screens, tables and chairs, baskets and boxes. At the end of the Ming Dynasty, Zhou Zhu, a craftsman in Yangzhou, further perfected and popularized this craft, carving landscape figures and tree stands with gold and silver wire, precious stones, pearls, corals, tourmalines, jadeites, crystals, agates, armadillos, lapis lazuli, turquoise, ivory, beeswax, agarwood and other materials. In Qing Dynasty, the ruling class blindly pursued elegance and complexity, attached great importance to the technological effect, and regarded "strangeness" as precious. Therefore, inlaying was often required in many handicrafts, especially in the court, all kinds of rubies and sapphires were inlaid into patterns to form exquisite works, also known as "treasure inlaying".