Synful and Contrabased
A largely misunderstood concept in the Enneagram, due to its intuitive nature, are the two instinctual flows: Syn & Contra.
Sarah compared synflows to hobbits and contras to elves, and the example has always stuck with me.
Syns are personal, contras are conceptual.
Syns complete the arc, contras disrupt or renew it.