πρόοδος · the procession

The outward movement: each level pours from the one above without being planned, without effort and without the source losing anything, and each level is less unified and more multiple than its parent — dimmer by exactly the distance.

The Tree's emanation, in the geometry the Greeks actually used. The wing draws it concentric on purpose: a ladder is a Hebrew image, and drawing Plotinus as one would quietly reskin him as a Kabbalist.