Yeah I know but it is he difference in the images from those two inner half hemispheres for want of better description that gives us that "binocular" vision. In reality this is only a tiny part of the "illusion" for want of a better term again that we are seeing it is as down to what you see and I see and interpret much like some of those weirdo paintings that one sees (no pun) that you see the critics stand back and rave on about the aesthetics of.
Good examples would be Picasso and that awful Blue Poles our incredibly discernible politicians down here bought some years ago for an exorbitant amount of money that quite frankly I think a kindergarten child could do before play lunch
You see it is that we are like snowflakes none of us are the same ie fingerprints - or so they tell us and I have often wondered what my brain albeit a fairly small and simple one interprets the incoming light wavelength as blue might be red for another and so on.
I have often wondered what it would be lie to have the vision say birds especially those of the predatory kind and life forms such as the squid where the light detecting cone and rod cells in the retina actually face forward whereas human eyes they face backwards making out vision that much less powerful and acute as those creatures. I think I am right in stating that they also have more of those receptor cells that increase their visual ability over us.
My last bit of trivia is that that birds "see" moving objects in far greater detail when it comes to moving objects ie we see things moving at a rate of 25 frames per second whereas birds see them in a time frames of approx 60 per second. you can see the effect if you put your video recorder on slow motion and you will see it moves in "jerks" and those jerks are 25 seconds apart but played at full speed appear to be a constant movement. Now birds having that different time fame see moving things at a much faster rate of frames - 60 per second and probably explains why there are so many birds killed on the road for instance because this phenomenon causes the bird to see it moving slower than it actually is. Of course you must take into account that some species of birds might be just dim witted like me!
So next time you go on holidays and take a look at the panorama you'll know that you are panning across the Grand Canyon for example in 25 images per second and not the sweeping movement you think you are seeing