清风明月

1. • lit. cool breeze and bright moon (idiom)
2. • fig. peaceful and clear night
3. • living a solitary and quiet life

     allusively

Character by character

• 清(qīng)Qing (Wade-Giles: Ch'ing) dynasty of China
• 风(fēng)wind
• 明(míng)Ming Dynasty
• 月(yuè)moon