YN YANG AROMATHERAPY STONES MASSAGE

The Great One produces the two poles (Heaven and Earth), which in turn give rise to the energies of the dark (yin) and the light (yang). These two energies then transform themselves, one rising upwards, and the other descending downwards; they merge again and give rise to form. (Lu-sih ch'un-ch'iu - Spring and Autumn Annals)