When I was 17 or so, I remember sitting outside one summer day reading a book, looking up at the leaves against the light blue sky, and noticing a light band around the leaves. I took it to be an optical illusion. In the following days and weeks, I notice a similar light band around animals, inanimate objects and also humans. And it was slightly different in each case. Around plants, a vitality and also quite uniform. Around animals, a little more alive and varied further out. Around inanimate object, very simple and clear. Around humans, even more varied further out.
This difference around different types of objects suggested that it was something more than an optical illusion, and I soon realized that what I was seeing was more of a property of the object I saw it around. One or two years later I met someone who was much more familiar with this and helped me be more comfortable with it, partly through looking at the field around people and recognizing that we saw the same thing, or at least something so similar that the differences were not noticeable in language.