2, the most common specification of rice paper, this is four feet. When a four-foot block is converted into centimeters, it is generally 138 cm ×69 cm, and the aspect ratio is 2: 1. In other words, this four-foot-long, equivalent to two square pieces of paper (69×69CM) spliced together. If these two squares are separated, then each square is the so-called "four-foot square". This is a verdict. Another common cutting method is to cut a four-foot piece into two pieces. Horizontal writing is called a banner, and vertical writing is generally called a banner.