Iso 2768 Mk |work| -

— straightness, flatness, circularity, cylindricity, parallelism, perpendicularity, symmetry, runout. All the invisible governors that prevent a part from lying about its shape.

— not loose, not tight. The engineer's gamble that most shops, most tools, most days will land inside the lines. No heroics. No over-spec. Just the quiet confidence of statistical normalcy. iso 2768 mk

But here's the deep cut:

Honor it, but don't worship it.