CREATIVE MACHINES. “And suddenly we noticed that one of the neurons was tracking faces. It was tracking our faces as we were moving around. Now, the spooky thing about this is that we never trained the system to recognize human faces and yet, somehow, it learned to do that. Even though these robots are very simple, we can see that something else is going on there. It is not just programming.” (Professor Hod Lipson).
https://link.springer.com/chapter/10.1007/978-3-030-03633-1_14