You might expect the spirals to rush towards, or emanate from, a black hole or point of infinite depth in the center. In fact, that is something I would normally do. Here I have put some dots and holes at that focal point.

This represents the evolution of the universe, the center is the origin. In the distance past the fundamental forces where unified, over time one than another split off and became a separate force. Each time this happened the universe underwent substantial macro changes.

OK, I made that story up after staring at the image trying to figure out how I felt about it. I put the holes and dots in the center just to do something different. Initially it felt out of place. But after the origin of the universe analogy, it felt perfect.