Before the fall, humans could see into the spiritual realms. Adam and Eve could see God walking in the garden. Well, they described it that way, because words were not good enough, but they did see him.
After they sinned, they lost that ability to see into the spiritual realms, and what was going on in other people’s spirits. Their eyes became more focussed on the physical world. That is why the realised they were naked. Before they sinned they were naked, but they were so focussed on the spiritual dimensions, that they never noticed.
I think that a residual of that seeing ability continues on in some people (maybe everyone). Some people have a residual of seeing that manifests when they are children. In traditional societies, they were probably selected for training to be shaman or tohunga. This tends to perverts the ability. In the west, we teach children that what they are seeing is not real, so it is drummed out of them early. Our Western education system quickly gets rid of all ability to see spiritually.
So the potential is there in many of us, but it has been destroyed by the fall. For a few people a residual remains, but often get knocked out of us by family or education.