Cloud screen refers to a screen inlaid with mica. Screen is a kind of furniture used to keep out the wind in ancient buildings, which is called "wind shielding". At the beginning, the screen was specially designed behind the throne of the emperor. It is framed by wood, covered with crimson silk, and painted with axes and cymbals as a symbol of the emperor's power. It is recorded in Historical Records that "the son of heaven stands on the screen". The use of screens began in the early Western Zhou Dynasty and was called "the ground". Later, the screen began to spread to the people and became an important part of the interior decoration of the people. Screens are generally displayed in a conspicuous position indoors, which plays the role of separation, beautification, wind protection and coordination. It and other classical furniture complement each other and become an indispensable part of home decoration, showing a harmonious and quiet atmosphere. During the Han and Tang Dynasties, almost all wealthy families used screens. The style of the screen has also increased compared with the previous generation. There are both single vertical screens and multiple curved screens, which can be folded or unfolded. Before the Han Dynasty, most of the screens were painted on wooden boards and painted with colors. After the invention of papermaking, paper paste became popular on the screen. Later, there was a screen insert purely for decoration, which was petite and interesting. The screen of princes and nobles is exquisite. They are made of mica, crystal, glass and other materials, and inlaid with ivory, jade, enamel, jade, gold and silver and other valuables, which can be described as extremely luxurious. Compared with the flower screen of Emperor Zhou's house, the folk plain screen is unique and leisurely. Most of the folk screen production advocates practicality and simplicity, and more is the display of plain screens, which has become increasingly popular since Wei and Jin Dynasties. Bai Juyi once wrote "The Story of Su Ping": "Without Li's seal script, his calligraphy, the flowers and birds on the frontier, his turquoise. I don't want to add a little painting to it. I want to be faithful and all white. " It can be seen that the poet advocates plain pictures. .