Drawing robot which can move on vertical surfaces without the need of aid, similar to a Roomba - video embedded below (action starts at 30 seconds):
The Vertwalker is a machine that can move on vertical surfaces. It can crawl on interior walls, take a walk on buildings and explore the city in a way humans can’t. Our “up” is its “forward”.
Carrying a marker, the Vertwalker becomes a painter. Exploring new territories in the vertical.
More at Sonice Development here