Time flies, and the dramatic changes of the human world fill one with emotion.
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history
From Ge Hong's 《神仙传·麻姑》 (Eastern Jin): the immortal Magu tells of having seen the Eastern Sea turn to mulberry fields three times — a literal cosmic timescale. The image stuck as shorthand for epochal change.
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Literary and reflective. Use for sweeping change over decades or centuries — historical, geographic, or emotional. Overkill for last week's office reorg.
