A ritual cloth of this size would have been used by Tibetan monks when handling ritual objects during tantric services. For a similar geometric ritual cloth, though not in as good condition, see Chinese Textile Masterpieces: Sung, Yuan & Ming Dynasties, Plum Blossoms (Int'l) Ltd., Hong Kong, 25 October - 3 November, 1988, cat. no. 17, p. 40 - 41 and Chinese and Central Asian Textiles: Selected Articles from Orientations 1983 - 1997, 1998, p. 67, fig. 22.