枯山水的石子

Quick answer：

The stones of the dry landscape watercolor style. The 'dry landscape watercolor style,' also known as 'ka shan shui,' is a traditional Chinese painting technique characterized by sparse, minimalist brushwork and the use of black and white ink to convey a sense of emptiness and depth. Stones in this style are typically depicted with bold, geometric shapes, emphasizing the artistic principle of yin-yang balance and the concept of 'less is more.'