Blank, is in the creation of calligraphy and painting, in order to make the whole work more harmonious and exquisite, and deliberately leave the corresponding blank, leaving room for imagination. Ink and wash are left blank, and the virtual and the real are born together. Cherish ink as gold, and count white as black. A few strokes of painters painted a picture of heaven and earth between square inches, staring at a wonderful place without painting. Calligraphy pays attention to "sparseness", in which "sparseness" means simplicity and blank space. Calligraphy pays attention to blank space, but blank space should not be too full. If it is full, it will be chaotic, and it should not be too small. If it is too small, it will be space.