This seventeenth-century engraving of Jesus Christ wearing a crown of thorns is titled "One with a single line. Indeed, what from a distance resembles an ordinary drawing is, up close, an image created with a single line that spirals in a spiral.

All details of the face and the transitions of light and shadow are created by the thickening of this line. The author is French artist Claude Mellan.

For the artist's contemporaries, his method of engraving remained a mystery, and no one has been able to repeat it.