The moon represents the luminance of one's hometown, while the painting captures the melancholy at the tip of the brush.
月是故鄉明，畫是筆尖愁
Having departed from one's homeland, one can paint the radiant moon, but the essence of the hometown remains elusive in the artistry.
背離了故鄉，畫出了明月，畫不出故鄉。