If, indeed, a page for general theory discussion is something people want, it should be a blog, I think. We'll try it this way. If you have a theory, this will be the place to post it and have responses given, for now.
Full Metal Fan had this theory to put forward:
"I had this theory on the Philosopher's Stone talk page, and this was the article that gave me the idea for this page. Anyway, here it is:
I have a theory that I want to add to the page, but first I want some people's opinions on it. My theory (for the manga and Brotherhood only) is that the Philosopher's Stone becomes more like a liquid and less like a stone the more souls are used in it, eventually becoming a blood-like substance. I think this for a few reasons.
First, Kimblee's original stone (made of Ishvalans) is jagged and looks a lot like a normal stone/rock. However, the one made from the researchers (which Envy calls an "upgrade", implying that more souls were used) is a ball with no edges, but still no liquid properties. Marcoh's stone (which presumably has the most souls, since he stole all the research data) is the most liquid-like, it can be poured, but will still take a shape if it is allowed.
Second, the homunculi have the stone as their heart. They have also said that the have bodies like humans, so therefore the "heart" must pump around a kind of "blood". I believe this "blood" is a liquid form of the stone, existing in that state because of the many souls in it.
Well, that's my theory. Feedback is much appreciated so I can make any necessary changes to the page. Thanks.--Full Metal Fan 23:56, August 6, 2010 (UTC) "