I've been told that the retina of the human eye recieves the image flipped and so the brain has the reflip it to see it the correct way. In 1890's George Stratton proved that if the retina recieved the image unflipped then after a few days the brain stops flipping it since it doesn't need to. This shows that the brain is actively readjusting the image to see it the correct way, is there an advantage to this? If the brain didn't flip the image wouldn't we just learn to see like that without any extra difficulties?