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Claude Mellan's Face of Christ, also known as The Sudarium of Saint Veronica (1649), is one of the most technically extraordinary works in art history... The entire portrait is rendered using a single, continuous spiralling line that begins at the tip of Christ's nose and expands outward to the edges of the cloth. Mellan achieved the illusion of depth, shadow, and facial features without any cross-hatching or traditional shading. Instead, he precisely varied the thickness and pressure of the burin (his engraving tool) as he rotated the copper plate, creating "swelling" lines that darken the image where needed. The spiralling line is estimated to be approximately 150m (about 500ft) long if it were stretched out.