Generally speaking, there must be water in the wheel, water in the ball or both, and water must flow to achieve the effect of water wheel operation or water polo operation. As the saying goes, "people can manage money in the mountains." The operation of waterwheel or water polo will inevitably form water potential, and the continuous circulation of water is to create an endless stream and play the best role in promoting wealth transfer. Nowadays, most feng shui wheels are equipped with lights. As the saying goes, "Water dominates Yang, while mountains dominate Yin". Lamps have decorative functions, which can enhance yang and promote wealth.