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. According to Tibetan Buddhist belief, spinning a prayer wheel is just as effective as reciting the sacred texts aloud.
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Sig Nordal 