Essentially, al-Farabi applies Aristotle’s notion of ergon to the cosmos and each of its members. Accordingly, the cosmos as such is not only determined by a certain order, it actually represents the best of all possible structures, as it is the effect of the over-perfect first cause.[18] Consequently, every part of the cosmos possesses a specific function which it must perform in order to keep the perpetuum mobile cosmos running smoothly, without interruptions and disturbances. While everythi