if on closure exam you may want to add to your post as you note the crossing of cloud formation in the extend from triangle sides that are clear indication of six sides or six arcs of force or two tri cusps creation for a total of six.
The cloud in hex for each side of the hex being an extend of the side of the straight hex side show a near perfect crossing of force event to spin on the horizontal plane of view.
Thus the spiral arm effect would tend to lead to the postulation that indeed with six spirals, three you point out are still indicative of a two three sided one triangle going one way the other going opposite direction.... but in the join event creating a spin and allowance for effect that seems to indicate arms going one way in spiral release ... the magnetic field force over the minor other triangle .. this is a paradox of view where we expect one form of action but there is more going on and in closer look you will see the effect.
I will post below two drawing to refer back to picture expand of my drawing from two six cusps.
Enjoy my friend .. graham