Kū shuǐ shuǐ de sha zi

Quick answer：

The phrase 'Kū shuǐ shuǐ de sha zi' refers to the concept of 'Karesansui,' which is a traditional Japanese Zen rock garden. It involves arranging sand or gravel in a certain pattern to represent a natural landscape, often with the use of rocks and small plants. Karesansui is a form of Japanese dry landscape gardening, and it is intended to evoke a sense of calm and meditative beauty.