 http://upload.wikimedia.org/wikipedi...ist_Monks.jpeg  A fresco of two Buddhist monks from the Bezeklik grottoes in China's Tarim Basin in the Xinjiang region. The White man on the left is thought to be a Tocharian, one of the descendants of the White Tarim mummies.      If true, it matters little, because the Chinese obviously came up with much of their own culture. If they borrowed some useful techniques or technologies, they wouldn't be the first to do so - and of course, an exchange could have gone both ways, as it has in more historic times.