I remember ~12 years ago coming across the concept of "the easy things are hard, the hard things are easy" (in the context of a robotics class). The example I

I remember ~12 years ago coming across the concept of "the easy things are hard, the hard things are easy" (in the context of a robotics class). The example I remember from the time was the relative ease of translating the decision trees of pharmacists (who in the US today earn a doctorate degree before practicing) into code versus catching a softly lobbed tennis ball with a robotic arm. A kid in elementary school can do the second task using their own arm without giving it any thought, but creating a hardware/software system to track the moving object, estimate trajectory, extrapolate future location, decide which rotations/translations need to be applied about the joints of the shoulder/arm/elbow/wrist to move your hand into the right position to make the catch, and then to actuate your hand closed at the right time with the right pressure is quite involved.