The gray surface of the cave stone series is blended with the beauty of simple linear streak, just like the stalactites in the cave bent upward against the light, and the stone chambers are overlapped and scattered, natural, quiet and deep. A kind of not deliberately highlighting decoration and appearance, let time wash away the dust of the world, precipitate and contaminate the soul of the world, quiet heart arises spontaneously, across the axis of space, through both ends, become the only flow in space, a warm side of the pure land.