One of the two primordial ancestors of the Tao, born when the sky god cast a length of bamboo onto the mountain and a man came forth as the cane split open. As with the stone-born ancestor, his knees swelled and produced children, and the union of the two knee-born lineages founded humankind while marriage within a single line yielded deformed offspring. Sources treat the stone-born and bamboo-born ancestors as paired co-founders; the bamboo-born ancestor's personal name is likewise not preserved.