What are the characteristics of Longfeng jade in Han Dynasty?

In the modeling of dragon and phoenix jade articles in Han Dynasty, it is often seen that Yi Long is in the sky and a phoenix belongs to the prime minister. Or a big dragon comes out of the cloud, and a little dragon stares around. This structure is different from the static symmetry in which the left and right sides are almost mirror images in the original traditional modeling. That is, the artistic conception of "the image outside the image" as the ancients in China said, so as to achieve a higher level of balance. At the same time, the body shape of Longfeng is mostly "S" type. The shape of "S" is of great aesthetic significance, with different sizes, vivid and orderly, smooth turning without any obstruction, square, full of tension and elasticity.