Prayer Wheels in the Hexi Corridor

These gorgeous 6 foot tall prayer wheels were outside a Tibetan Buddhist temple in the Qilian Mountain foothills.
In Buddhism, a prayer wheel is of a hollow metal cylinder, often beautifully embossed, mounted on a rod handle and containing a tightly wound scroll printed with a mantra. Prayer wheels come in many sizes: they may be small, attached to a stick, and spun around by hand, medium-sized and set up at monasteries or temples, or very large and continuously spun by a wind or water mill.
Prayer wheels are used primarily by the Buddhists of Tibet and Nepal, where hand-held prayer wheels are carried by pilgrims and other devotees and turned during devotional activities.
According to Tibetan Buddhist belief, spinning a prayer wheel is just as effective as reciting the sacred texts aloud. This belief derives from the Buddhist belief in the power of sound and the formulas to which deities are subject. For many Buddhists, the prayer wheel also represents the Wheel of the Law (or Dharma) set in motion by the Buddha.
The prayer wheel is also useful for illiterate members of the lay Buddhist community, since they can "read" the prayers by turning the wheel.