Traditional Chinese painting pays attention to "knowing the white and keeping the black", which means "the black is the painting, the white is blank". The blank space left on the screen must be valued like the image of the painting. In other words, the blank space left must be reasonable It must conform to the composition rules. It is best to avoid the same size and shape of the blank, the blankest to be round and square, and the blank to be scattered like stars. The good blanks are large and small, all are irregular triangles, and the blanks are completely uniform. What does this text mean? ['Characteristics of Traditional Chinese Painting.', 'Composition Principles of Traditional Chinese Painting.', 'Appreciation angle of traditional Chinese painting.', 'Ink skills in traditional Chinese painting.']