That's correct about the 2-d images. Some people cannot or have great difficulty in interpreting them. Lawrence of Arabia discovered this when sketching in the evenings at encampments with the Bedouin fighters, who were not accustomed to line drawings on paper. They were accustomed to script, but not line drawings, and they were seemingly quite unable to interpret his drawings. (It wasn't because he couldn't draw, either. He was a good amature artist.)

It's not that the Bedouin lacked the innate ability in any way, they were just culturally unfamiliar with the concept, that's all. They could see things Lawrence couldn't too...in terms of signs in the sand, that sort of thing. With training, either one could learn to see what the other saw quite easily and "naturally".

Some people can see auras. All people could most likely see auras, providing they grew up in a culture that supported the idea and encouraged it. I can see a pale aura around myself under dim lighting conditions...as long as I'm relaxed and not really thinking about it. Then I suddenly realize I'm seeing it. I have to remain mentally quite relaxed or I tend to lose sight of the aura. I've known people who are WAY better at seeing them than I am, and I have no reason whatsoever to doubt their word about it.