Dimensions: Height: 33.5 cm, Width: 15.5cm Chinese Qing Dynasty Yongzheng Sky Blue Glazed Porcelain Cong Vase. Cong is a kind of cylindrical jade round inside and square outside, consisting of a circular tube shape with protruding square corners. Its square and circular shape could be interpreted as the unity of heaven and earth where the square represents the earth and a circle represents heaven. Warm and uniform blue glaze applied to the whole surface, only the upper mouth rim and outer bottom is white glazed. Blue is the most important variety of China’s porcelain. Blue stands for healing, trust and long life. Shades of blue are used to decorate homes for longevity and harmony.The Under bears a reign mark, a six under glazed blue script characters reign mark. Made in The Years YongZheng Reign Period of The Great Qing Dynasty.