Notice the simple and crude lines. And look at the dragon; it has four claws. This is called a crawling dragon, and such dragons were made only before the Han Dynasty.
而壁上的釉，卻已大都剝落了，但是可以很清晰地看見一條造型古樸的龍攀在壁上，線條粗獷而簡單，「這是爬龍，是秦漢以前的造型。