== Robotics == 

 The current boom in robotics recalls many of the developments in algebraic kinematics in the 19th and 20th centuries. Many terms were developed and concepts of motion described. Active transformations were called alibi transformations, connoting a change of place. Passive transformations were called alias transformations, connoting a change of name. But in robotics one must remember that there are frames of reference for laboratory as well as the robot, and the use of referential terms like active and passive soon lose clarity. In geometry, the notion of an abstract motion that generates congruence became useful. Are there contributors to the project here that can build this article into an enduring reference? It looks like a job for an army.