You're misunderstanding how the brain works. The eye actually "sees" things upside down. The brain doesn't "flip back" the image, as if often portrayed, but, in a series of (of course) complex neural processes, puts things back together.
There have been experiments in which people were asked to wear upside-down glasses. After a period of extreme disorientation, their brains started to adapt, and after a while, they were able to move around normally.
Same thing happens with the view camera. Do it just a couple of times, and yes, you see things upside down and it's confusing. Practice often enough, the brain adjusts, and although you do see upside down, you don't see things, people, etc.
as upside down anymore. As stated in the article posted below: "Images reach the eye in some peculiar fashion, and if that peculiar fashion is consistent, a person's visual system eventually, somehow, adjusts to interpret it — to perceive it, to see it — as being no different from normal."
A researcher wearing goggles that inverted everything stumbled about wildly at first, but soon enough he was able to ride a bicycle
www.theguardian.com
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