Remember sand art from when you were a kid? It's that craft where you took a clear, empty bottle and poured in layer upon layer of colored sand until the whole thing was filled to the brim.

Before sand, they used crushed colored stone. Now Samten travels around ... Decades of mandalas Samten, in his mid-60s, learned the craft at the feet of the Dalai Lama. “When I was a teenager ...