In addition to walking around the temple and spinning prayer wheels, pilgrims prostrate themselves before approaching the main deity; some crawl a considerable distance to the main shrine. The prayer chanted during this worship is ""Om mani padme hum"" (Hail to the jewel in the lotus). Pilgrims queue on both sides of the platform to place a ceremonial scarf ("katak") around the Buddha's neck or touch the image's knee. A walled enclosure in front of the Jokhang, near the Tang Dynasty-Tubo Peace Alliance Tablet, contains the stump of a willow known as the "Tang Dynstay Willow" or the "Princess Willow". The willow was reportedly planted by Princess Wencheng.