No matter who has good or bad calligraphy and painting, some are valuable and some are not valuable, some are expensive and some are relatively cheap, so we cannot generally use square feet to talk about it, we can only say how much a certain piece is. money per square foot. Runge doesn't have any accuracy, it's just a reference. It mainly depends on his own judgment and understanding of his calligraphy and painting, as well as the market hype at the time. If it is a celebrity, the value may be higher. If it is not a celebrity, it depends on the quality of the calligraphy and painting, whether it has characteristics, etc., and cannot be generalized. It’s my own opinion, please forgive me if I’m wrong!