Traditional Chinese painting pays attention to knowing the white and keeping the black, which means that the black is the painting and the white is the blank. The blank  left on the picture should be valued as much as the image of the painting. In other words, the blank  should be reasonable and conform to the composition rules. The most taboo is the same size and shape of the blank, the most taboo is the blank like round, square, the most taboo is the blank scattered like stars. Good blanks are large and small, are irregular triangles and the blanks left are complete and unified.
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The composition principle of traditional chinese painting.