Scribit, the wall-crawling graffiti robot that can draw (and, just as importantly, erase) any image you can think of onto a vertical surface of your choice, made its debut this week at CES 2019 ...

The robot’s basic design is inspired by the Plotclock, which uses a similar setup to draw the time. We’ve seen other tic-tac-toe ‘bots before, as well as some clever electronic ...