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Message: <blockquote data-quote="WayneLigon" data-source="post: 3696476" data-attributes="member: 3649">Then there is no good reason there should be people there, either. Or things with bilateral symmetry. Life forms are the way they are for a very good reason. Any gene pool that's going to produce humans is also going to produce bears, spiders and humpback whales. If you're going for even the sem-scientific approach.The other major reason is as mentioned: for fantasy to work, there needs to be a substancial groundwork of the familiar for people to grasp on to. There have been games (and books and movies) that have gone the other way, and they've stayed in their tiny niche for a very good reason.It also saves you work as a GM. If you're going to populate your world with totally unfamiliar creatures, then be prepared to answer questions about them since you'd best be prepared to tell me what my PC knows about the world he lives in.</blockquote>