This is a robotic head that I designed and built when I was 12. It had 3 motors with rubber band belt driven pulleys, that allowed the eyes to move left/right/up/down, and the mouth to open and close. It was actually built to the 1:1 scale of my younger brother’s head at the time. I drew up all the plans in 3d before so I knew how much wood that I would need, and even drew up a complete to-scale parts list for it, before starting building. It had a control box made out of balsa, with batteries and buttons so that I could control the motors remotely.