#$%^&*AU2012244178A120131010.pdf#####ABSTRACT A device comprising a level line detector selectively oriented in reference to a surface a moveable arm and a processor in communication with the detector and arm to selectively move the arm, to maintain the arm in surface reference. In another embodiment, a system comprising a level line detector selectively oriented in reference to a surface a moveable arm a processor in communication with the detector and arm to selectively move the arm, to maintain the arm in surface reference and a level line to communicate with the detector. In another embodiment, a method comprising: selectively orienting a level line detector in reference to a surface detecting a level line communicating detection data to a moveable arm and moving the arm based on the data, to maintain surface reference.2/6 -F0
