FitzChiv.... I thought I did give an example of a SF book where technology isn't based onthing that actually exists today....or are you saying that ESP, telekinesis etc are scientifically accepted phenomenon? And, I maintain that the distinction you're making between magic and high-tech is entirely subjective. You state that magic has no rules (which is debatable anyways
) and that it isn't based on anything we know today. Well, there are plenty of physical laws broken in SF....the most obvious being FTL travel....also artificial gravity without using acceleration.....on what current scientific method is this being based? I could make the argument that magic is based on a long tradition of spiritual/mystical powers which, while not scientifically proven, certainly have a very large base of believers. Don't get me wrong, I'm not saying there's no difference. Just that the difference is a subjective one. Both magic and high tech violate several known physical laws, both can claim some very vague, dubious roots in the present and past.
If pressed, I would suggest the following distinction. SF is based on humanity's reliance on itself and the things we can build, Fantasy is based on humanity's struggle with itself as well as higher powers and beings that can't be fully understood. The former assumes the ability to know all, the latter assumes that mysteries exist which humanity can never quite resolve. *shrug* McCaffrey's Rowan/Tower series is generally considered to be SF...this is probably because ESP etc are powers of the brain...a power internal and controlled by the humans. On a purely technology versus magic criteria I personally think ESP etc should be more closely aligned with magic. Which would make it Fantasy.
Of course, what is the real difference between ESP being something driven by humanity, and someone born with the ability to channel the One Power (Jordan)? Um, perception I'd say. Again, we're back to an entirely subjective call.
Perhaps we should just say that if it has spaceships it's SF and if not, well, then it's fantasy
(j/k)