Copper engraving is one of the oldest and most precise methods of printmaking, in which an image is cut directly into a copper plate, inked, and pressed onto paper. The technique dominated European illustration from the 1500s through the early 1800s, producing everything from natural history plates and anatomical studies to maps and scientific diagrams. At its best, the medium rewards close looking: fine cross-hatching, crisp line work, and hand-applied color that no modern process quite replicates. The period originals here come from that long tradition.