Animal-faced (holding a metal ring in the mouth) ornament on doors(AFOD)is a traditionalornament on doors in China. It can be found in every portrait stone area all over the country.
铺首衔环是我国传统的门上装饰，遍布于全国各个画像石分布区。
参考来源 - 汉代画像石中铺首衔环图像的形成与演变·2,447,543篇论文数据，部分数据来源于NoteExpress
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