Chigi (architecture)

Chigi (千木, 鎮木, 知木, 知疑^?), Okichigi (置千木^?) or Higi (氷木^?) are forked roof finials found in Japanese and Shinto Architecture. Chigi predate Buddhist influence and are an architectural element endemic to Japan. They are an important aesthetic aspect of Shinto shrines, where they are often paired with katsuogi, another type of roof ornamentation. Today, chigi and katsuogi are used exclusively on Shinto buildings and distinguish them from other religious structures, such as Buddhist temples in Japan.

Chigi are thought to have been employed on Japanese buildings starting from the 1st century AD. Their existence during the Jōmon period (250–538) is well documented by numerous artifacts. Measurements for chigi were mentioned in an early document, the Taishinpō Enryaku Gishikichō (太神宝延暦儀式帳), written in 804 AD.

The evolutionary origins of the chigi are not known. One theory is that they were simply interlocking bargeboard planks that were left uncut. Another is that they were part of a support system anchored on the ground to stabilize the roof. Yet another theory proposes that they were used to "pinch" and hold thatch roofing together. Evidence of this can be seen in minka, or common traditional homes, where two interlocking timbers are often found at the roof gables. However, the only certain fact is that chigi were originally a working part of the structure, but as building techniques improved, their function was lost and they were left as decorations.

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