It might not be completely analogous, but do you reckon a group for both Christians and Satanists would fair well? For the art it doesn't matter, but the themes themselves are too conflicting to confine in one group.
Furthermore, by placing astrology with several science subjects you insinuate that astrology is scientific, which it's not. That's why I think it's counterproductive.
If you would've prominently stated that astrology is not scientific, there wouldn't be much of a problem. Right now you give ignorant people validation in believing in astrology. I mean, in the astrology folder I see an image called "My Goodluck Charms". All good and well, but how does that relate to stargazing?
Anyway, do note I'm not angry and I'm not looking for conflicts. I just wanted to voice my concerns. The astrology folder does feature some nice art, but that's besides the point.