 These included a "pilot light" at the very top, an intricate apparatus terminating in three white wire-frame spheres that rotate in planetary fashion (representing his gyroscopic stabilizers), a pair of reciprocating arms in the shape of an inverted "V", multiple flashing lights, and an elaborate horizontal array of moving levers resembling saxophone keys.Conical protuberances attached to each side of the head carry two small forward-facing blinking lights (his eyes) and two rotating chromed rings, one mounted vertically and the other horizontally, which represent Robby's audio detectors (his ears).The bottom front section of the head is a curved grille consisting of parallel rows of thin blue neon tubes, which light up in synchronization with Robby's voice.