You can't help but notice when you first meet Ace - three eyes! Try not to stare. But then, if your head starts to slowly tilt 90 degrees to decipher his chestal settings, you will hear a sharpish metallic voice alerting you, "Hey! my eyes are up here!"

Back in 1978, running the Boston Marathon as an endurance check, a fellow runner (human) mistook Ace's hydrogen-flask-head for a water bottle at mile 18. It was awkward. Since then, Ace has worked to improve robot - human relations. The "Robot dance"? That was Ace's first big success!.