2, mirror flower water moon: refers to the moon in the water, flowers in the mirror. Metaphor is an illusory scene that cannot be touched. It also refers to the flexible and unpredictable artistic conception in poetry. The story of "Looking at the Moon in a Mirror" comes from the Tang Dynasty poet Zhang Jiuling's "Feeling".
3, painting cakes to fill hunger: it means painting cakes to fill hunger. Metaphor is to comfort yourself with fantasy, or to deceive others. This idiom comes from The Biography of the Three Kingdoms Shu Wei Lu Yu.