From Bai Juyi's Tang poem 《
江楼晚眺景物鲜奇吟玩成篇寄水部张员外》:
风翻白浪花千片,
雁点青天字一行 (Wind flips the white waves into a thousand petals; geese dot the blue sky, a line of writing.) A celebrated parallel couplet - the waves are 'flower petals,' the geese 'a line of characters,' turning sky and water into natural calligraphy.