 Most of the artificial bodies are moved by an external mover, although automats or machines have their motor inside, and Avempace adds “I have explained it in the science of Politics” (which is lost) (IB-S1a: 25. 4; IB-S1e: 15). The mover is identical with the form. He distinguishes two kinds of perfecting forms, namely forms moving by means of an instrument or not (IB-S1a: 28; IB-S1e: 17). The first kind is nature, the second, the soul.