My phone buzzes once, face-down on the table. Inside the case, a coin-sized motor spins an off-centre weight against a neodymium-iron-boron magnet. I got curious once about where that magnet actually comes from, and traced it backward; the trail stops being metaphorical almost immediately.
China accounts for roughly 70% of global rare-earth mining, which is the number everyone quotes and the least decisive one. The number that matters is downstream: 85–90% of global processing capacity, and for the heavier rare earths, 98–99% of separation capacity. The chokepoint isn't the hole in the ground. It's the refinery.
A large share of that ore comes from around Bayan Obo, in Inner Mongolia — the largest known rare-earth deposit on the planet — and gets refined nearby at Baotou. Since 1965, Baotou Steel's refineries have pumped their tailings into a purpose-built dam outside the city: a circular embankment now 11.5 kilometres around, engineered to eventually hold close to 234 million cubic metres of black slurry. People who've filmed it call it a lake — a kind word for it, but I take the point; "tailings dam" doesn't convey the scale nearly as well. Chinese authorities confirmed in 2016 that farmland around it had been contaminated, and researchers have documented crop losses and health complaints in the villages nearby for years before that.
Draw the boundary correctly and that lake is the actual size of a vibration motor. Nobody signed a permit that read "flood this floodplain so a phone can buzz quietly in a pocket on the other side of the planet." The technosphere doesn't move through permits like that. It moves through several billion small, unrelated purchases, and the backward trace was never one I was asked to make at the register, any more than anyone else is.
This is the field-note discipline at its plainest, and it cost me one evening with a search engine, not a research grant: not a metaphor about interconnection, an actual supply chain, followed one link at a time until it stops being abstract. Nothing currently prices that lake into the sale. Metabolic Standing is one sketch of an instrument that would have to.