Codex on the Flight of Birds of a kite as seeking a wind current. When the winds are high, one will see the bird very high in the sky, but when the winds are low, the bird stays closer to the ground. Leonardo describes how a bird rests in the air, after flapping its wings to gain altitude, by gliding downward to the ground. Folio 6 contains multiple diagrams of birds flying and their bone structure, and all of the commentary is on flight and how birds fly the way that they do. Leonardo starts off by describing how a bird ascends or descends in different
Zun belongs to those with bird and beast designs. The whole vessel uses thunder pattern as the background, the beak and breast carry cicada pattern, the two sides of the neck carry the Kui pattern (Kui is a legendary dragon with one horn and one foot), the wings carry snake pattern and the tail has the design of a flying owl. The whole piece has rich, delicate and diverse patterns. In appearance, this owl looks solemn and powerful with its two legs and tail form a triangle support the vessel. The shape is firm and lifelike. It is a perfect combination