~Note~ This is more of an out of game theory than anything.
*Warning, this is a long read and some may find it useless...
Before I begin, I'd like to mention that an amount of this theory developed by statements from others. Including Aristotle.
First, I believe there are four( possibly five) elements that govern reality. Aristotle said that each object is composed of one element or another. And that this is why some objects fall faster than others. He was proven wrong by science and mathematics. I instead propose that each element is in ALL things, yet governs different parts of the object. Consider that the element of Fire is simply the element of energy. If you heat up an object, you are increasing the element of Fire in said object. The element of Earth is the element of durability. This is the element that makes objects tangible and resistant. Then you move on to the element of Air. Air is the element that determines an objects ability to move. It is possible to move anything, I believe. And finally, there is the element of Water. Water is the element that makes something "bounce back." This is the "healing" element and is often more seen in rubber. In all objects, each element is present. However, the elements are not always balanced in an object. In some objects, one or more Elements dominate the others.
Next we'll move to us. I've thought, recently, that maybe each element represents a different part of a person. And by part I mean Mind, Body, Spirit and Soul. I could be wrong, but I'd say that the Soul is the Spirit as the Mind is to the Body. This would mean that the Mind and Soul are the perceptive sides, while the Body and Spirit are the sensitive sides. Obviously the Body and Mind are the physical pieces, while the Spirit and Soul are the ethereal pieces. Now what if we assign an element to represent each portion of our existence? The Body would be Earth while the Mind would be Air as that is balance. Which would in turn make the Soul the element of Fire and the spirit the element of Water. I would also like to add that we do not interact with each other with just our Bodies. I believe we interact with each other with all four portions of ourselves. I believe that all people are connected in such a way that it is best explained as a floor covered with marbles. When one marble moves in any way with any amount of energy, it will often hit the other marbles around it, affecting them and causing them to collide with even more marbles. Obviously this strike will lose it's power and energy after so long, however, imagine that all the marbles are moving at the same times, bouncing around and affecting those around them. This is because people are constantly interacting with one another. It is in this, that we write the destinies of others as much as we write our own.
Finally, I'd like to move on to the "realms" of this existence. I may now believe in "heaven and hell". Obviously Hell is the realm of Fire while Heaven is the realm of Water. This can even be proven in the bible by the "eternal life in Heaven" deal. Consider that this is why people die in this realm, the realm dominate of the element of Earth. The only element that I'm having a hard time with how the realm works is the realm of Air. For this realm, I've given it a variable name of Zephyr. I believe it to be the realm of the unknown.... It would be a realm in which we can only begin to understand.
In conclusion, I think this may help explain many things. Emotions, death, immortality and why we cannot have it on this realm, etc etc. I leave this open to the public because it is unrelated to the game, I think.