They are. They’re gravitationally bound into galaxies in much the same way that atoms are electromagnetically bound into molecules. These galaxies then group into clusters and strands, not too different from messy cobweb. Which molecules can do too.

You could probably keep going. The universe is basically a sponge. It’s not like, super poetic or anything. It’s just a sponge. I mean, unless sponges have some poetic metaphor I’m unfamiliar with.