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Skip to 0 minutes and 3 secondsNext, 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.

Skip to 0 minutes and 52 secondsAlso, 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.

Skip to 2 minutes and 2 secondsFor 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.

Skip to 3 minutes and 15 secondsSo 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.

Skip to 4 minutes and 10 secondsAlso 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.

基本的な装訂の種類2 – 折本

このステップでは、折本について学んでいきます。以下のテキストを読んだ後、佐々木教授のお話をビデオでご覧ください。

2. 折本(おりほん)

Orihon (according-style binding) 図1. 折本

続いて折本(おりほん)です。

巻子装と同様に貼り継いだ紙を、軸を付けずに一定の幅で前後に重ねて折り畳み、最初と最後に表紙を付けた装訂です。基本は表面のみを用いますが、ひっくり返しても構造に変化がないので、裏を用いることも少なくありません。巻子装より読みやすく、巻き戻す必要もないので、便利な装訂と言えます。

Kise inhon-kyō 図2. 起世因本経(足利尊氏願経)
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中国で出版された経典でよく用いられた装訂であったためか、日本でもお経の使用例は多いのですが(図2)、文学作品での使用例は少なく、どうも非公式というか特殊なものと認識されていたようです。折目が付くので絵巻的な作品では殆ど用いられませんが、系図や旅行のガイドブックのようなものでの使用例は少なくありません(図3)。

Genji monogatari keizu 図3. 源氏物語系図
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これは巻子装と同様に一度に多くの部分を見る事ができることも関係していると考えられます。また両手を離しても安定しますので、今日に至るまで書道の手本に利用されています。紙継の糊が剥がれるとバラバラになるのが難点と言えます。数え方の単位は「帖(じょう)」です。

2-a. 折帖

折本と関連する装訂を2つ併せて説明します。1つ目は折帖です(図4~6)。

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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折本とよく似た構造なのですが、厚い紙を用いていたり、紙を背中合わせに貼り合わせていたりするために、巻子装のように巻くことができない装訂を「折帖(おりじょう)」と呼びます。厚紙を用いたものは台紙として、和歌や絵が描かれた色紙や短冊を貼り込むためのものに使用されます。

2-b. 画帖装

2つ目は画帖装です。紙を背中合わせに貼り合わせるのは折帖と同じですが、背の部分を表紙で覆って冊子に近い状態にしたものを「画帖装(がじょうそう)」と呼びます。見開きで継ぎ目のない絵や図を保存されるために用いられた装訂で、江戸後期の多色刷り版本に目立つものです(図7)。

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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