"Doufang" is a common term in the field of Chinese painting. A box is a bucket, and the most common one is a ruler of 69*69cm(2 square feet) with a width of 4 square feet. This ruler is made of a four-foot poster (2 square feet wide and 4 square feet long) along the length direction.
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Dou Fang's quotation explanation:
1. A foot square of calligraphy and painting paper. Also refers to a one-foot square picture book painting and calligraphy.
Qing Li Yu's "Casual Sending, Playing with Instruments, Screen Axe": "Ten years ago, there were only three styles for painting and calligraphy screens and scrolls: middle strip, bucket and horizontal batch."
Ten years ago, anyone who made screens and scrolls of calligraphy and painting had three kinds of paper: middle strip, square bucket and horizontal batch.
Chapter 11 of Li Zicheng by Yao Yinxue: "An adjutant immediately took out a bucket and held it in front of him."
An adjutant immediately took out a bucket and put his hands in front of him.
2, square.
Mao Dun Exercise 2: "Xinjia, when I first came in, I saw that this yard was surrounded by wind and fire walls several feet high." ?
Xinjia, when I first came in, I saw a square yard surrounded by a few feet high wind and fire wall.
Baidu Encyclopedia-Doufang