They were luxurious books using paper decorated with mica and elaborate designs on the binding, published at the beginning of the 17th century (during the Keicho-Genna years (Japan))
17世紀の始め（慶長・元和(日本)期）に作られ、雲母刷の用紙を使ったり、装丁に意匠が凝らされた豪華本であった。