The shrine at Naikū is constructed of Japanese cypress. Built on pillars set directly in the ground, the shrine building measures 10.9 by 5.5 meters and includes a raised floor, verandas all the way around the building and a staircase leading to a single central doorway. The Naikū does not have any windows. The roof is made of thatched reed with ten billets (katsuogi) located on the ridge of the roof, the bargeboards of which project beyond the roof to form the distinctive forked finials (chigi) at the ends of the ridge. The chigi on the roof of the Naikū are flat on top, rather than pointed, which serves as a distinction for the gender of the deity being represented. In the case of Ise, Amaterasu, a female deity, is represented at the shrine, which is why the chigi are flat. The roof ridge is supported by two free-standing columns called the munamochi-bashira. The katsuogi, chigi and munamochi-bashira are stylised forms of older storehouse building techniques that pre-date the introduction of Buddhist architecture in Japan.