A molecular assembler has never been photographed. It exists as specification — Drexler's *Nanosystems*, the Nanofactory Collaboration's diamond mechanosynthesis papers — and as the imaging convention that would have to record it. That convention is the scanning electron microscope: one secondary-electron detector, one scalar value per pixel, no colour channel at any point in the signal path.

So this system is grey because the instrument is grey. Specimen surface sits at mid-tone against a vacuum field that returns almost nothing. Edges over-emit and blow to white. Everything human — labels, scale bars, lattice geometry, accelerating voltage — arrives as crisp thin-line vector burned in over a softly imaged surface. Nothing is illustrated. Everything is measured.