Many have heard of Aristotle's First Unmoved Mover, the one that moves all things without being moved. Very few, however, have managed to capture the ultimate meaning of that entity. Explaining why it is necessary the existence of such a First Unmoved Mover is one of the goals of this book, but, even more, its journey allows us to understand why Aristotle maintained that there are a total of 55 Unmoved Movers, not just one. The key is Aristotelian...