We Learned to Read the Doorstep. Now We Must Learn to Read Each Other.

The instruments of 2124 are extraordinary. We can log a reservoir to the centimeter, a temperature anomaly to a tenth of a degree, a migrant corridor to the last of its 112 million registered souls. We have never been better at counting what is happening to us. What we have not built — and it cannot be manufactured at Aurora or traded on the Cerulean — is a shared arithmetic of obligation. A family in Jakarta raises its floor alone because no ledger records the debt a warming world owes it. A voter in Brazil decides on Saturday who may alter their own body, because we never agreed on what a body is owed. The Concordat can allocate water; it cannot allocate mercy. Our machines answer every question we can phrase precisely. The question that matters resists precision: not *how much water is left*, but *whom do we leave to measure it alone*. Precision was the easy century. Fairness is the hard one, and it has not started.