Cleo, a prototype surgical robot. Cleo was designed as a prototype for possible future surgical robots. At about 3.5 cm on each side, Cleo is small enough to fit inside the colon of an adult. it is equipped with a tiny claw to grasp or carry objects, two small antennae for obstacle avoidance, and tilt sensors. Cleo may be steered by a joystick, or navigate under its own guidance. Future versions might be able to perform taks such as polyp removal. It was designed by James McLurkin, at MIT.