... move around. Between two structural layers of paper, the robot has a copper layer in which conductive paths are engraved. The paper is coated with a polymer layer that has a shape memory. A processor and tiny motors on the surface enable the movement. Two motors, each synchronized by a microprocessor, control two legs. There are mechanical links to the robot body, the dynamics of which translate the motor forces into movement. Thanks to the special design, the turn of a single crank is enough to generate a relatively complex movement, says Erik Demaine.