Essentially, this pattern is completely constructed from alternating regular heptagons and equilateral triangles. You can scan the image and you will see there are no two heptagons that are connected by an edge and the same goes for the triangles.
The gaps between the regular polygons resemble bats. The bats spiral around and have two different appearances. I find the most visually interesting spot near the centre of the spirals where it's tricky to find the pattern of the bats. The regularity increases further from that centre.
I framed the image with one of the spiral arms. It seemed a natural choice.
