Prayer Wheels referred to as a prayer mill. In places with a Tibetan Buddhist tradition, prayer wheels ( Tib. cho-khor) appear as a series of vertical drums that turn on their axes set in a large installation around the circumference of a stupa or a shrine. When a practitioner walks around the installation in a clockwise direction and rubs each one with the right hand as he or she passes, they are sent rotating. In the interiors, thousands of mantras are thought to be activated as the drums on which they are inscribed rotate.