Surprise is one number made from two, and the feeling does not come labelled with which term moved: a world that fell short and an expectation that had grown produce readings identical to the third decimal. A single reading is a line of position, not a fix — which is why the numerator gets convicted, why disagreement is the only gauge of a denominator, and why a forecast written before the world arrives is the one artifact that makes the next reading identifiable. … readOne Reading, Two Unknowns