You are not a person.
You have a person.
You have many of them.
How you are acting is what determines the person (mask) you are.
A person is a mask.
Persona : "a social role or a character played by an actor. The word is derived from Latin, where it originally referred to a theatrical mask."
https://en.wikipedia.org/wiki/Persona
(CLICK 2X to see FULL SIZE! ;-)
Persona:
"Its meaning in the latter Roman period changed to indicate a "character" of a theatrical performance or court of law, when it became apparent that different individuals could assume the same role, and legal attributes such as rights, powers, and duties followed the role. The same individuals as actors could play different roles, each with its own legal attributes, sometimes even in the same court appearance."
Please consider the drawing above and examine the details.
On the left you can see many types of moods. These are all types of natural persons you could be. Notice the small i to signify to the audience this particular person is in the form of a living man, with the spirit naturally bound in that person-character. The i utilizes the "head" on top, stating that it is not decapitated.
A man must have his head, in order to have his spirit.
On the right you see the LEGAL PERSON, which always uses A DECAPITATED I, signifying that a man must choose to pick up the mask and wear it in order to bring it to life.
This is why your ALL CAPITALS NAME is your LEGAL PERSON, and why your LEGAL PERSON is written in ALL CAPITALS.
Now go look at all of your LEGAL documents and see your ALL CAPS NAME.
(more about CAPITAL LETTER styles later...)