《 Shījīng 》 de dìyī shǒu shī jiù xiědào le xìngcài.
The very first poem of the Book of Songs already mentions floating heart.
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Known from 关雎, the first poem of the 诗经: 参差荇菜，左右流之, 'uneven grows the floating heart, left and right we gather it'. Gathering the water plant goes with a young man's longing for a girl, and it became a classic image of courtship.
