The artist robot arm

why don't we have a robot arm which can paint?

We can make drawings,paintings,and sketches from tablets in to the computer but here on my project I want to paint from the computer/machine to canvas or papers. As you can see on the picture on my wall the guy is using his arm to paint so, my whole target is to replace this in machine arm. My first target in the first phase is to program the machine to paint the Ethiopian national flag then after some observations of programming and other courses I will preceed to the next advanced level. Robots across the glob are designed for different purposes some of them include:- for heavy repetitive manufacturing work,to handle difficult,dangerous,or boring tasks for humans.Types of robots include:-swarm robots,industrial robots,military robots,mobile and servicing robots.My robot arm will have different purpose which is to paint so, let us have a machine arm which can replace artist's arm.The machine will be consisting of three parts:the base,the arm,and the hand.These three parts have their own function and will be joined by a joint system, brush and paints are also part of the machine.