Nice thread. 
 Originally Posted by LiveInTheDream
It seems to me that simple science can explain the basic idea of what's going on here, but it doesn't answer the full question of "how". You see, sounds are generated by vibrations in the air, and we pick those up with our ears. In dreams, obviously, there's no air, we don't hear by our ears, and vibrations are impossible, considering none of it exists. But how the brain can generate something during a dream that it can't grasp during waking life is beyond me.
I suppose it's all about how you view perception, real/unreal. From what I've been reading lately, I gather that the brain creates our own reality, whether we are awake or dreaming. The brain creates the sounds for us, in our own head. The input from the ears (or other senses, whatever), is just used to tell the brain which sound (or smell etc) to create for us. When I was a kid I used to wonder, "Does everybody else see "blue" the way I see blue?" Maybe their brain renders it differently, but ultimately it doesn't matter, because everybody can identify the same colours and colour combinations. (Except those with colour-blindness of course)
Therefore, when we dream, the brain still goes about its business of creating a reality, free of the constraints of sensory input, and its limits. The apparatus in the human ear is only able to pick up a certain range of note pitches, and there are a finite number of light wavelengths which can be seen by the human eye. My best guess is that the brain can (and regularly does, in dreams) go beyond what is physically possible using our waking senses, and create music, sights, and methods of perception that are not only impossible in waking life, but incomprehensible to us when we wake.
 Originally Posted by LiveInTheDream
I've wondered about new colors, too...we don't perceive colors by light reflection in dreams, so we could see new colors, too. And who knows what else? Feeling every object around us at once because we don't have to make physical contact with it in order to do so, seeing in 360 degree vision (I know that one's been discussed, at least)...
Has anyone else had something like this happen?
I do think things like feeling every object around and 360 degree vision are possible in dreams, but it would involve completely letting go of how you expect to perceive reality. Me? I like to remain very aware of my body in the dream, it keeps me grounded and everything more vivid- but I'm sure with practice, one could learn to break out of the habit of using their limited physical body to "sense" stimuli in dreams, because it is not in fact necessary. What do you think?
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