Idea: Building Dot Matrix Printer

It would use a small robot that would move around on the buildings face by pulling tethers. Electric paint sprayers and a vacuum hood would do the bulk of the work. Refilling would be done by retreating to home. Power would be delivered over one of the tethers. Colors would be mixed mid spray to keep from having to premix paints.

Ideally, the whole paint process could be completed at night.

Wow……it would make a lot of waste though.