This video shows what some (French?) people have done with a spray can, a piece of string, two motors, a laptop and a fuck load of imagination and knowhow. It's an Automatic Graffiti Machine. As far as I can see, you put a picture, or some kind of image map into a computer and the computer then control's the length of string and spray can to draw the image on a flat surface. It's the same principle that engineers use when they have to draw big plans on paper with autocad..
One thing I know for sure is I really want an Automatic Graffiti Machine
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