Activity Vase (Wyl. las bum)--ritual practices generally involve two vases containing sacred water, which have a similar appearance: the main vase, and the activity vase. Through the power of deity, mantra, mudra and samadhi, the main vase is transformed into the palace and its water into the mandala of deities for the duration of the practice, and is generally placed in the center of mandala. The activity vase is used for water purification during the different stages of the ritual for ceremonies such as empowerments. The activity vase, used by the chöpon, is usually placed on the vajra master’s table.