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.