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[Dan:] > rationality and irrationality are mutually exclusive. No arguments here .. it's all good solid thinking. It reminded me of something which I'll put forward for perusal (and abusal) .. taken from Paul Davies' "About Time: Einstein's Unfinished Revolution" - in an effort to learn more about how humans perceive the sensation of touch, an experiment was performed where a patient's arm was touched with a needle, and the length of time until the brain received this information was recorded. Then the doctors noted the area of the brain stimulated by this action, and then tried stimulating the brain directly, to see how much faster this was. It was slower. It became obvious that how the brain perceives time was not nearly as clear-cut as they thought. Now this doesn't negate Dan's example of the bent-stick light coming to your eyes - it's a good example: the stick isn't bent. But it should be pointed out that the light, in itself, doesn't "mean" anything. Meaning is imposed onto the percept data by our brains, using knowledge we've built up about the world. So the point is: the stick appears bent in water, yet we know (or 'know') it's straight - a seemingly irrational and inexplicable situation .. but we learn about optics and the properties of water, and all is revealed .. so what is seemingly irrational today, may be simply be a pointer to knowledge that is yet to be uncovered. Also. there is a tendency to take the situation as transmitted by the light as "the truth", but perhaps this is only because we're equipped with sensory organs that detect light. What if we had eyes that saw something else entirely? What if (assuming Cahill and Klinger are right for a sec') we could see "gebits" instead of the structures that build up around them? Would the stick be straight or bent then? Would it be anything like a stick at all? Of course I'm ignoring what all your other senses tell you .. "devil's advocate" anyone? Anyway, as I say Dan this isn't any kind of argument with your e-mail, just me off on a tangent again ;-) And of course straight sticks are just as good as bendy sticks as long as they're sticky .... Time for coffee, John