Square book - Masutabon

Japanese: 枡型本 - ますがたぼん

A modified Japanese book format in which the top, bottom and left and right dimensions are almost the same. The size varies depending on the size of the paper. If the paper is cut vertically (along the short side) into three pieces and folded in half, it becomes a square-shaped book, which is called a mutsuhan book. If the paper is cut horizontally into half or three pieces and folded in half, it becomes a wide book, which is called a yokohon, and a yokohon that is even shorter in top and bottom is called a makurahon. [Takegami Shin]

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

和書の形の変型判で，本の天地･左右の寸法がほぼ同じもの。大きさは，料紙の大きさによって異なる。料紙を縦に(短尺に沿って)3截して二つ折りにすると枡型本になるが，これを六半（むつはん）本という。また，料紙を横に半截ないし3截して二つ折りにすると横長の本になるが，これを横本といい，横本のうちさらに天地が短いものは枕本という。【竹上深】

出典　株式会社平凡社世界大百科事典第２版について　情報

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