“Come in, uncles,” shouted Stone boy. They obeyed him, and stepping to the center he said: “Watch me build my fence.” Suiting the words, he took from his belt an arrow with a white stone fastened to the point and fastening it to his bow, he shot it high in the air. Straight up into the air it went, for two or three thousand feet, then seemed to stop suddenly and turned with point down and descended as swiftly as it had ascended. Upon striking the ground a high stone wall arose, enclosing the hut and all who were inside. Just then the buffalo broke the last stockade only to fill the last ditch up again. In vain did the leaders butt the stone wall. They hurt themselves, broke their horns and mashed their snouts, but could not even scar the wall.

Myths and Legends of the Sioux, p. 196-197