Taihu stone
Guanyunfeng (冠云峰) in Lingering Garden
Taihu stone (Chinese: 太湖石) or porous stone is a kind of limestone produced at the foot of Dongting Mountain (洞庭山) in Suzhou, which is close to Taihu Lake. Due to long-term surging by water, this kind of stone is featured by pores and holes.[1]