Our Puzzling Encounters Considered, and then pick whichever album to go with next. They only have two other ones.
I suppose it wasn't a fair comparison, as I haven't even taken calculus yet. lol: Not until next year. I never have trouble with math, anyway. But I do forget it easily when I don't practice it.
The atmosphere is really, uh, mathematical is all I can think of with it. A whole bunch of nurabers that are related and complex, batting around the inside of your head in some sonic format. Gnomesain?