A bright vertical scan bar sweeps across a dark plate and, only where it passes, a hidden blueprint schematic bleeds through — a technical drawing of grid lines, concentric bore circles, bolt-hole rings and cross-hairs. The revealed layer glows hottest right at the scan front (with a chromatic split), then decays into a fading trail behind the bar. The bar sweeps autonomously; move the pointer to drive it by hand, and scroll to widen or narrow the beam.