Prayer wheels are very common in the Himalayas. They come in all shapes and sizes. Some are hand held, some are mounted along spiritual sites such as stūpas. They can be very small, or big as a telephone booth (or even bigger), made of wood or metal. A mantra, usually oṃ maṇi padme hūṃ (ཨོཾ་མ་ཎི་པདྨེ་ཧཱུཾ་ –…