Why were the pebbles piled upon the spurt of water?

The pebbles were likely piled upon the spurt of water to create a temporary barrier or to direct the flow, emphasizing the natural dynamics of the scene. This arrangement could also symbolize the interplay between nature and human intervention, showcasing how people interact with their environment. Additionally, the pebbles may serve as a visual focal point, enhancing the aesthetic appeal of the water's movement.