Some weird occurrences that are troubling me - Part 2

[CCoburn]

Unexplained events/issues started happening in 2018 such as:

• fleeting images of something black (approximately 12 x 12 inches in size)
  

I've experienced some of this, similar somewhat in nature to the shadow person phenomenon; often times though in my particular case I could never be absolutely certain that I actually saw something.

With respect to "fleeting" and peripheral images. I tried to understand why such occurrences can only be observed in this manner and not 'head-on'; then this proposal occurred to me:

Given that the way the human visual mechanism functions with light energy reflecting off objects to not only alter the frequency of the light as a function of color, but to also allow for any perception of an object at all, so the idea here is that the physical density of some beings/entities is not material enough to actually reflect light energy, so it just passes right through them which in effect renders them imperceptible to the visual mechanism.

So the actions of the above just results in this "fleeting" obscurity where these things are oblivious to mundane 'protocols', but still remain vaguely observable in some circumstances such as peripheral sightings even though the proper criteria for 'seeing' is apparently incomplete, i.e. there may always exist exceptions to certain rules and in this particular case it's the rules of direct versus indirect observation.