Daniel Chodowiecki
From Wiki @ Karl Jones dot com
Daniel Niklaus Chodowiecki (16 October 1726 – 7 February 1801) was a Polish—and later German—painter and printmaker with Huguenot ancestry, who is most famous as an etcher.
Biography
He spent most of his life in Berlin, and became the director of the Berlin Academy of Art.
Invention of the remarque
In printmaking, Chodowiecki is credited with the invention of the deliberate remarque, a small sketch on a plate, lying outside the main image.
These were originally little sketches or doodles by artists, not really meant to be seen, but Chodowiecki turned them into "bonus items" for collectors.