"With a Thread"

This 17th century engraving depicting Jesus Christ wearing a crown of thorns is called "With a Thread".

The design turns out to be an image created with the help of ONE SINGLE LINE, which twists in a spiral.

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

To the artist's contemporaries, his engraving method remained a mystery, and no one was able to repeat it.

Source: Quora