I don't know how they've done it, but this is apparently the visualization of the mathematical equation of what the 8th dimension looks like. Or something like that. I currently have this as my desktop pattern, because it's so beautiful and I'm hoping that maybe it will make my brain grow by having it around on a daily basis.
This is another diagram of this phenomenon, called a Coxeter plane root system. If you want to try and learn about this stuff, check out this Website
Otherwise, I hope you can just enjoy how beautiful nature ends up being, even when it's pure math.