Largely earth-like other than the existence of magic and other supernatural phenomena/beings, mostly for sake of convenience and also because there is nothing I specifically want out of changing natural laws; I will not change them just because it seems "cool" or "unique". To change something I must reap some tangible benefit. For example, I could have a year with eight months and only 248 days, but why? I have no purpose for this; I gain nothing. The world is a cube because I don't want to deal with map projection inaccuracy.
Cosmology
There is far more value in the conflict between different interpretations of cosmogony than in knowing the "true" one. I will not elaborate on a "true" cosmogony; you will not rob me of my mystery and see my universe stripped bare for your perverse pleasure.