It never ceases to amaze me how CNC machines work. When I was a kid I thought that it must be very easy to produce any piece you want, as long as you just have the machine. It's definitely not the case, as you can clearly see from the videos. I had no idea that these two pieces are going to be such a simple shape in the end ;-)
As you know more about CNC, I am sure you appreciate this work even more!