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 #ClaudeMellan.

For the artist's contemporaries, his method of engraving remained a mystery, and no one has been able to repeat it.
https://twitter.com/andtartary2/status/1657035899358662657