Link:
https://www.greattibettour.com/tibetan-culture/sand-mandalas.html Sand Mandala is the most unique and exquisite religious art in Tibetan Buddhism. During large-scale ritual activities, the lamas in the temple use millions of sand grains to depict the grand world of the Buddhist country. This process may last for several days or even several months. However, the precise sand art created by the lamas with great efforts is not used to show the world its beauty. The world depicted in the sand will be swept away without hesitation, and it will disappear in an instant. And those sand will be put into bottles and poured into rivers.