Lit from within to reveal the machinery beneath its skin, this second-generation face robot from the Hara-Kobayashi laboratory at the Science University of Tokyo, Japan, has shape-memory actuators that move like muscles creating facial expressions beneath the robot's silicon skin. Made of metal strips that change their shape when an electric current passes through them, the actuators return to their original form when the current stops. The robot head is lit from within by a pencil light strobe cloaked in a yellow gel.From the book Robo sapiens: Evolution of a New Species, page 77.