Fig. 2From: Research on the historical and cultural value of and protection strategy for rammed earth watchtower houses in Chongqing, ChinaLeft: architectural picture of an ancient watchtower in Eastern Han Dynasty tomb portrait bricks in Chengdu (Source: http://www.mrjjxw.com/articles/2019-07-23/1356643.html). Right: a pottery five-layer green glazed watchtower unearthed from Han tombs in Wuwei, Gansu Province (Source: Official website of National Museum of China)Back to article page