What does the calligraphy limit mean "four feet beyond the standard size"?

Calligraphy is limited to "the standard size is more than four feet", which means that it is ok to be larger than four feet.

Common specifications and dimensions of calligraphy:

Chinese painting Xuan paper size (unit: cm)

Tripod: 50* 100 Big Tripod: 69* 100 Tripod Full Open: 100 x 55 Tripod Single: 100 x 27 Tripod Horizontal Batch: 100 x 55 Sanfa:/kloc-

Four-legged fully open: 138 x 69 four-legged single: 138 x 34 four-legged horizontal batch: 138 x 69 four-legged football association: 138 x 34 four-legged square: 69 x 68 four-legged three-open: 69 x 46 four-legged four-open: 69 x 34 four-legged.

Five-foot fully open: 153 x 84 five-foot single: 153 x 42 five-foot horizontal batch: 153 x 84 five-foot joint: 153 x 42 five-foot square: 84 x 77

Six feet full open: 180 x 97 six feet three open: 97 x 60 six feet couplet: 180 x 49 six feet square: 97 x 90

Seven feet fully open: 238 x 129

In the early days of the People's Republic of China, one foot in calligraphy and painting was equal to 30 cm. Now it's all 1 foot equals 33 centimeters.

Nowadays, rice paper is mostly mechanized because of its advanced technology, so the length and width of the paper can be cut at will.

On the market, Xuan paper is full of life propaganda (Chinese painting is a little dizzy), cooked propaganda (meticulous brushwork and writing are not very good) and half-life propaganda. The length of the size is 33 cm, which is one foot. At present, most of them are 3 feet, 4 feet, 5 feet and 6 feet long on the market.