In traditional painting in China, the grid on Xuan paper is usually divided equally, which is used for painting evaluation, positioning and reference. The size of the grid can be adjusted according to the size and requirements of the painting. Felt can be used to support Xuan paper and increase the smoothness and stability of the paper, but it does not determine the size of the grid.
In short, the size of the grid on Xuan paper depends on the needs and personal preferences of the painter or calligrapher, and has nothing to do with the size of the felt. If you have specific painting or calligraphy needs, you can choose the appropriate grid size according to the actual situation.