Robots are capable of far more precise and accurate motion than humans are. That is great when you want a robot to assemble a PCB or perform heart surgery. But it’s a problem when you want robots do something creative — they’re just too perfect. The lack of human-introduced flaws makes robot artwork feel soulless. To overcome that, Georgia Tech graduate students built a graffiti robot called GTGraffiti that paints with the fluidity of a human.