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The natural and artificial systems that move things across geological timescales—glaciers that carve valleys over millennia, tectonic plates that rearrange continents over eons, and human institutions that change so slowly they might as well be geological. Long-duration motion machines include the slowly shifting course of rivers, the gradual uplift of mountains, and the federal government, which moves with approximately the same speed and predictability as a continent, just with more paperwork.
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