which kami are venerated be kept clean and not neglected. Through to the Edo period, it was common for kami shrines to be demolished and rebuilt at a nearby location in order to remove any pollutants and ensure purity. This has continued into recent times at certain sites, such as the Ise Grand Shrine, which is moved to an adjacent site every two decades. Separate shrines can also be merged in a process known as jinja gappei, while the act of transferring the kami from one building to another is called sengu. Shrines may have legends about their foundation, which are known as en-gi. These sometimes also record miracles associated with the shrine. From the Heian period on, the en-gi were often retold on picture scrolls known as emakimono. Priesthood and miko Shrines may be cared for by priests, by local communities, or by families on whose property the shrine is found. Shinto priests are known in Japanese as , meaning "proprietor of ", or alternatively as or . Many kannushi take on the role in a line of hereditary succession traced down specific families. In contemporary Japan, there are two main training universities for those wishing to become , at Kokugakuin University in Tokyo and at Kogakkan University in Mie Prefecture. Priests can rise through the ranks over the course of their careers. The number of priests at a particular shrine can vary; some shrines can have dozens, and others have none, instead being administered by local lay volunteers. Some priests administer to multiple small shrines, sometimes over ten. Priestly costume is largely based on the clothes worn at the imperial court during the Heian period. It includes a tall, rounded hat known as an , and black lacquered wooden clogs known as . The outer garment worn by a priest, usually colored black, red, or light blue, is the , or the . A white silk version of the , used for formal occasions, is known as the . Another priestly robe is the , which is modelled on Heian-style hunting garments. Also part of standard priestly attire is a fan, while during rituals, priests carry a flat piece of wood known as a . This costume is generally more ornate than the sombre garments worn by Japanese Buddhist monks. The chief priest at a shrine is the . Larger shrines may also have an assistant head priest,