and their yorishiro gradually evolved into today's shrines, whose origins can be still seen in the Japanese words for "mountain" and "forest", which can also mean "shrine". Many shrines have on their grounds one of the original great yorishiro: a big tree, surrounded by a sacred rope called . The first buildings at places dedicated to worship were hut-like structures built to house some yorishiro. A trace of this origin can be found in the term , "deity storehouse", which evolved into hokora (written with the same characters 神庫), and is considered to be one of the first words for shrine. First temporary shrines True shrines arose with the beginning of agriculture, when the need arose to attract kami to ensure good harvests. These were, however, just temporary structures built for a particular purpose, a tradition of which traces can be found in some rituals. Hints of the first shrines can still be found here and there. Ōmiwa Shrine in Nara, for example, contains no sacred images or objects because it is believed to serve the mountain on which it stands—images or objects are therefore unnecessary. For the same reason, it has a worship hall, a , but no place to house the kami, called . Archeology confirms that, during the Yayoi period, the most common (a yorishiro actually housing the enshrined kami) in the earliest shrines were nearby mountain peaks that supplied stream water to the plains where people lived. Besides the already mentioned Ōmiwa Shrine, another important example is Mount Nantai, a phallus-shaped mountain in Nikko which constitutes Futarasan Shrine's shintai. Significantly, the name means "man's body". The mountain not only provides water to the rice paddies below but has the shape of the phallic stone rods found in pre-agricultural Jōmon sites. Rites and ceremonies In 905 CE, Emperor Daigo ordered a compilation of Shinto rites and rules. Previous attempts at codification are known to have taken place, but, neither the Konin nor the Jogan Gishiki survive. Initially under the direction of Fujiwara no Tokihira, the project stalled at his death in April 909. Fujiwara no Tadahira, his brother, took charge and in 912 and in 927 the Engi-shiki (延喜式, literally: "Procedures of the Engi Era") was promulgated in fifty volumes. This, the first formal codification of Shinto rites and Norito (liturgies and prayers) to survive, became the basis for all subsequent Shinto liturgical practice and efforts. In