Harry Potter is a product of a human mind, made manifested in TV series.
Gravity is a product of a human mind, manifested in a dream world of a spinning ball earth. Is it real?
Also considering that physics as we know of today was derived mainly from Newton, and Newton was both a mason and occultist, you can pretty much toss physics right out the window as having any type of merit.
Is gravity really the product of a human mind? Consider. People stay on the ground rather than floating off into the sky. If a person is sitting on a tree branch, and he falls off, he winds up on the ground. If you are at the top of the Empire State Building, and you hold a ball over the edge, when you let go of the ball, it moves towards the ground.
If the above, and all kinds of similar things in addition, are simply products of a human mind, then we are truly living in a Matrix-like artificial universe.
If, on the other hand, things fall towards the earth if they have nothing holding them aloft, gravity exists... and it works.
Now, the theories about why gravity works the way it does, or theories about what gravity is made of, all might be incorrect. But people mostly don't think about the theories when they think about gravity. What they think of is stuff falling towards the ground if nothing holds it up higher than the ground.
What this means is that gravity exists no matter what you call it. Go to, say, the Bing translator at
http://www.bing.com/translator/. Type in the word "gravity." Then use the translator to see the various forms of the word in the various languages supported by Bing. Many of the forms of this word are very different from "g r a v i t y." But they all mean the same thing.
If you really want to transpose the word "density" for the word "gravity," you have the right to do so. But why? You are simply mixing people up who understand the word "gravity" to describe exactly the same natural action as the "density" you are using. Doing this is causing chaos rather than order, and it certainly isn't furthering your flat earth ideals.
It's kinda like when nomad****** uses perversion to try to uphold a serious flat earth idea. All he is doing when he does this is to turn people against the flat earth idea... except possibly some other perverts.