@Fil Albuquerque,
I think it goes without say that "Is"ness is easy to explain.
while "Is"ness is based on the physics and mechanics, "Me"ness relies upon personal interpretation of ones own emotions to explain or conclude their existence.
"Is"ness is simply simple because, it is like saying, "The universe, whether physical or illusion, simply is. That is unchanging reality. We are, and determined effects of nature are, they simply are. We can evaluate "Is"ness as being provided to a scientific community in Facts, while "me"ness is entirely testimony.
Such a testimony of "Me"ness is as though to say, "I am without unity to the world around me. When the fly flies, I am without understanding of it's goals, nor it to mine. Yet, in actuality, I am a portion of those fly's curiosities, and it is a contributing factor to my musing."
one is built upon "rational stipulations"(Is-ness) for scientific evaluation, while the other is a foundation for providing Material used for philosophical evaluation {Social Science.}(Me-ness).