"Mirror of Himiko" is Ma-kyo.

Where it was manufactured elaborate metal replica bronze mirror of ancient there is a theory of the " mirror of Himiko " using the (3D) printer three -dimensional " Sankakubuchishinjukyo " , in of the reflected light that is projected onto the wall it can be seen that the phenomenon called pattern carved on the back of the mirror emerge as " Ma-kyo " occurs , Murakami curatorial director of the Kyoto National Museum that investigation was announced on the 29th .
It is believed to have used in the rituals of ancient mirror , but the specific role was unknown . This phenomenon is particularly noticeable in the parallel light , such as sunlight , there is also opinion to point out the relationship between the sun faith , it's likely to result in a new phase in the study of ancient mirrors .
Mirror that causes this phenomenon appeared in the Han Dynasty of ancient China . Such as those Christian was used hidden in the Edo period is known in Japan , but have been identified in ancient mirror domestic that for the first time .
There are irregularities on the back this phenomenon , when the thickness is polishing a non-uniform mirror , is that the concave surface , uneven appear in reflected light thin part becomes the convex surface a faint thick portion distortion occurs in the mirror body cause . And that appears to be a mirror there is a range in the entire thickness is thin , and there is a pattern that carved projecting deep on the back .
The thinnest portion is less than one millimeter edge of the triangle and the center of the back , such as the god of animals image thick Sankakubuchishinjukyo you have restored , whereas there about two centimeters the thickest portion of the center .
It is possible that the same phenomenon occurs even in ancient mirror " , although other conditions are aligned in particular this Sankakubuchishinjukyo . Was a mystery why I finished thinly so , but Murakami director was polished phenomenon to occur pointed out the possibility also " there . It is said, " becomes a clue to rethink the role of the ancient mirror " . I think it as led to a new discovery by that could be restored with the elaborate (3D) three-dimensional printer . I will be intrigued many ways is likely to come into view .



３次元（３Ｄ）プリンターを使って「卑弥呼の鏡」との説がある古代の青銅鏡「三角縁神獣鏡」の精巧な金属製レプリカを製作したところ、壁に投影した反射光の中に鏡の背面に刻んだ文様が浮かび上がる「魔鏡」と呼ばれる現象がおきることが分かり、調査した京都国立博物館の村上学芸部長が29日発表した。
　鏡は古代の祭祀で用いたと考えられているが、具体的役割は不明だった。この現象は太陽光線など平行光で特に顕著で、太陽信仰との関連を指摘する意見もあり、古代鏡の研究に新局面をもたらしそうだ。
　こうした現象をおこす鏡は古代中国の漢代に登場。日本では江戸時代に隠れキリシタンが用いたものなどが知られるが、国内の古代鏡で確認されたのは初めてという。
この現象は背面に凹凸があり、厚みが不均一な鏡を研磨する際、鏡本体にひずみが生じて厚い部分がかすかに凹面に、薄い部分が凸面になって反射光にムラがでることが原因。全体が薄く、背面に彫りが深い突出した文様があるなど厚みに幅がある鏡だと現れるという。
　復元した三角縁神獣鏡は背面の中央や三角形の縁部、神獣像などが厚く、中央の最厚部は約２センチあるのに対し最も薄い部分は１ミリ以下。
　村上部長は「他の古代鏡でも同じ現象がおきる可能性はあるが、この三角縁神獣鏡は特に条件がそろっている。なぜこんなに薄く仕上げたのか謎だったが、現象がおきるまで研磨した可能性もある」と指摘。「古代鏡の役割を考え直す手掛かりになれば」と話している。３次元（３Ｄ）プリンターを使って精巧に復元できたことによって新たな発見につながったように思いますね。いろいろな面が見えてきそうで興味を惹かれますね。