Why use "calligraphy cloud" to lead books to the sky of painting, so as to blend into nature?

The reasons why calligraphy can lead books into paintings and blend into nature are as follows:

1, the calligraphy cloud draws books into the sky, adding more wonderful substances, so it is more real.

2. Calligraphy paints a unique sky with calligraphy and painting, which is similar to the breath of nature, so it can be better integrated into nature.