Blargh. The phrase you're looking for is suspension of disbelief. Or something. However, that said, I'm just going to assume you're joking when you say that anything outside real-world physics must be magic which must therefor must be subject to a specifically D&D anti-magic field or something (because that was the contention I was replying to). I'm doing you a favor there, because that's arrant nonsense. Oh no, pegasi fall to earth and giants can't walk. Please. Not that you couldn't do that in your own game, go nuts, but lets not try to make an 'argument' about it (because there's no argument there).