You’ve gotta love Burt Munro
Christ’s face engraved in a single spiral line: Claude Mellan, “The Sudarium, or Veil of St Veronica,” engraving, France, 1649.
In a single line and starting from the tip of Jesus’ nose, Mellan has engraved the entire face, the folded veil, and the lettering below. The modulations in direction, from thick to thin, model the image in chiaroscuro (light and dark). Thus the shapes and volume of the engraving are achieved. [text via British Museum]