Light would be able to hit your retina from multiple directions without being filtered by the iris or focused by the cornea and lense, making your eyes little more useful than a simple light/dark sensor.Īn unaltered human being would not be able to move in the extra dimension, because you have no muscles arranged to pull that way-at least, until bits of you start folding up, re-arranging your muscle vectors in largely random ways.īut suppose you are equipped with 4D blinders. So.Īssuming your body didn't just fall apart on arrival, you wouldn't perceive much of anything. The definitive popular work on the subject is The Planiverse, although there are also other models (some of which have been discussed here before). I attempted, as one does with dimensions, to analyze the 2D->3D analogue, but didn't get anywhere because a 2D "biology" doesn't really make sense, so talking about what they would perceive doesn't really either.ĢD biology makes plenty of sense. Would our brain, being used to our 3D world, just process it as multiple 3D spaces stacked on top of each other instead of 3D spaces next to each other in a 4th direction? Would a human being be able to consciously move in the 4th direction?Īnd if these questions are unanswerable, then why? What would that human experience? Is there some biological/physical limit to our eyes that would prevent us from "perceiving" this 4th dimension, and we would just perceive a 3D slice of it? In my mind, there's no reason why photons coming from a trajectory that intersects this 4th direction couldn't reach our eyes. I am almost sure, based on an incredibly shoddy knowledge of physics, that there couldn't possibly be a 4th spatial dimension that we simply "can't perceive", because things (including ourselves) would be getting knocked into it all the time.īut what if, in a situation ala Flatland, a human being was transported to a completely different universe in which there were 4 spatial dimensions? Let's leave aside the fact that physics would have to be fundamentally different in such a universe, and assume a 4D analogue, as close as possible, to our own universe. Our universe has 3 global spatial dimensions - that much I know.
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