As a fair example of structure coalescing from randomness and simple physics,I have to hawk this* example called 'bloop' from my web 3d physics project. It is a cloud of gravitating bodies with a simple 'sticky' force between close neighbours, the strength of which varies like breeze. I find it reminiscent of the old 'bag in the wind' video.

[*] https://strainer.github.io/fancy/#12

I come upon things like this while playing with and debugging different forces. One very early, imploding world with simple gravity, created a surprising 'aleph-like' blob of flickering shapely artifacts. It blew my socks off but it was before proper version control and I'd have to do archeology to recreate it. Better to keep improving the physics and see what can pop up next ...