I described something like that in my "where the heck are we?" campaign pilot posts here. I think I used powers of 12.
Love to find an artist who'd be willing to help me with producing an approximation of mine (mine being set on an Alderson disk make things "interesting".
Re: Another fun site
Love to find an artist who'd be willing to help me with producing an approximation of mine (mine being set on an Alderson disk make things "interesting".