An ordinary ballpoint pen is held in a spring-loaded carrier ... which uses Canny edge detection to create an outline drawing, then fills in the empty bits to create bright and dark areas.

It’s a simple robot that drags a pen around to draw on paper ... The robot does a good job of plotting out a drawing on a small scale, with [Tim] using it to outline his name on paper.

GUANGZHOU, April 2 (Xinhua) -- After using a drawing pen to outline cartoon characters, Chinese designer Luo Yuan brightened stars via fluorescent markers. As lights dimmed, these stars held in the ...