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基本的な装訂の種類2 – 折本

基本的な装訂の種類2 – 折本
Next, let us look at accordion books (orihon). The leaves are connected in the same way as for scrolls but instead of rolling up the long strip of connected sheets around a roller you fold it repeatedly on itself like an accordion. You can read it by opening it up page by page or you can open it all. If you want to read it again you can open it at any point in the text you like and when you are finished it is easy to close it. So as a format, it is more practical than the scroll.
Also, because you can look at large portions of the text at the same time, it was used for maps or charts; this is a geneaology of the characters in the Tale of Genji. Parent-child relationships are marked by red lines, and the lines are easy to follow by simply opening the book as you go. Orihon was the most common format for genealogies. Another feature of accordion books is that you can turn them over and read the reverse side just as you read the front and some books are double sided. Another advantage is that whereas you have to hold normal book-style books open with your hands, orihon remain in position even if your fingers let go of them.
For this reason, they were popular for calligraphy copybooks and this book is one such example. Even today, it remains popular among calligraphy students who need to reproduce the sample writing of their masters and therefore need a book that stays open on the page you need. On first look these books here look like a orihon but the design is different. For example, this is a printed book. It looks like a orihon, but whereas you can open up a orihon and look at many pages at the same time, the back side of the pages are glued together like this, so it does not open more than this.
So although it may look like a orihon, the way the leaves are joined together is different. That’s why this type of books is sometimes called orijō (foldable booklet) instead of orihon. There is then another format which is very similar to accordion books but is made with extremely thick paper. You look at it like this and, like any orihon, it can be spread open to look at many pages at the same time. Since it is often used to keep poems written on strips of stiff paper (known as tanzaku), it is sometimes called tanzakuchō (tanzaku binding) and can be considered a subtype of accordion books.
Also like accordion books, it is absolutely identical if you turn it over, you see there are tanzaku strips on the rear side too, so it is meant to be used as a double-sided book. Also, I don’t have an example to show you here, but orijō books bound by applying glue on the outer spine on both sides of the book are sometimes called gajō-toji (album binding). And that is all for accordion-style books.


2. 折本(おりほん)

Orihon (according-style binding) 図1. 折本



Kise inhon-kyō 図2. 起世因本経(足利尊氏願経)
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Genji monogatari keizu 図3. 源氏物語系図
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2-a. 折帖


Booklet 図4. 加藤千蔭筆『万葉集抜書』
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Book 図5. 尊円親王真翰宝帖
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Tanzaku tekagami 図6. 短冊手鑑
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2-b. 画帖装


Shiohi no tsuto, 1 booklet illustrations by Kitagawa Utamaro 図7. 潮干のつと
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古書から読み解く日本の文化: 和本の世界

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