Background Engine Turn Guilloche

background-engine-turn-guilloche

A full-bleed ambient background reproducing engine-turning (guilloché), the rose-engine lathe technique used to engrave the dense woven rosette patterns on banknotes and security documents: three superimposed hypotrochoid passes at close, unequal lathe ratios beat against each other while the ratios drift and each pass spins independently, so the weave never locks into a static pattern.