What is the main idea of the form of animal case in Wadang, Western Han Dynasty?

In the Western Han Dynasty, in addition to characters, there were animal patterns, or patterns with both characters and patterns. Animal patterns also take the theme of "Four Gods" as the main form. For example, the two tiles "White Tiger" and "Suzaku" both take their images from reality and depict their different expressions and personalities. The two tiles are treated in the same way, that is, they are stretched as far as possible in the circle to form a typical "pattern adaptation" form without losing the natural expression of birds and animals. For example, "Long live Weiyang" tiles are illustrated with pictures and texts. In the form of concentrated radiation, words and gouyun are connected into flowers, and the stamens form a big "nipple", showing a vivid atmosphere. Another example is the tile composed of TIC-tac-toe chest nails and "Long live prosperity". Four Chinese characters and five round chest nails are interspersed into a chessboard, which looks neat and quiet. The two tiles have different tastes, but they both show a strong sense of decoration, showing the advantages of the Western Han Dynasty Wadang sculpture.