These questions have been asked for centuries, with numerous explanations. So here is mine.
When you look at this physical body and communicate with another physical body, we do so via the mouth, and with vocal sounds. Overtime, we learn what each sound mean as we communicate.
We also learn to do sign communication with our hands or limbs, and eyes too. We hear coming from the mouths of each body, other sounds. But we do not see who, or where these sounds originate.
We also learn overtime that the brain in our skulls operate like a computer. It receives thought waves, processes them, interprets them, and tells us what it is or mean. Some we file away for future reference, and others we act upon instantly.
This information receiving and interpreting continues non stop 24/7, until we physically die, or this body is not longer able to carry out these functions.
So Who Am I?
I am invisible, have always been invisible. I can only make my invisible self known to others in this physical reality, via the above manner.
Therefore, I was, and have always been invisible. I am perpetual, infinite, and beyond comprehension.
Derryck S. Griffith.