From
毛泽东 《菩萨蛮·大柏地》 (1933), written returning to a former battlefield:
赤橙黄绿青蓝紫，谁持彩练当空舞？雨后复斜阳，关山阵阵苍 (Red orange yellow green cyan blue violet - who holds the colored silks dancing in the sky? Rain gone, the slanting sun returns; pass after pass in gray procession). The first line lists the seven colors of the rainbow; the second is the question it suggests.
