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Movement that occurs over years, decades, or centuries—the drift of continents, the erosion of mountains, the slow transformation of a person from eager youth to jaded adult. Long-duration motion is the realm of glaciers, grief, and gradual change, too slow to perceive in real time but undeniable when you look back. It's why your parents seem to have aged overnight (they didn't, you just weren't paying attention) and why the photo of you from ten years ago looks like a different person (it was, basically).
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