I'm really excited that this topic actually exists here. For the past weeks I've been thinking about creating my own fantasy world - because there are not quite enough yet. My primary aim is to make "magic" plausible. Thus, it has to be actually part of the laws of nature, which makes it less magic but compared to our world, it still counts.
Anyway. The basic concept is as follows:
There are six different strings: fire, water, air, earth, force, life. The four element strings make up all of the matter by being woven into each other, thus creating this world's types of "molecules".
Force strings will attract each other, thus allowing for gravitation. As in our universe, each force will have its own mediators. Life strings will be necessary to allow plants and animals (people) to grow, have consciousness.
Some people have an additional organ, which allows them to manipulate one kind of string. This happens by creating a field which only affects one kind. For example. if you're a fire-weaver, you can exert influence on all fire strings in your surrounding area thus have the possibility to control fire. However you cannot create new strings, so water-weaving in the desert is significantly more difficult than on an ocean.
As stated, this is the basic concept, which I want to be fairly plausible before I go further into more details.
I'm looking forward to your feedback!
So in response to Zxyrra's answer (thank you very much for that! :) ), here are more details:
First of all the fantasy world inevitably has to differ from our worldview. I don't know if reality-check is even the right tag here.
Physical characteristics As of now, I'd only say they're smaller than microscopically perceivable. To form matter, they are woven into each other. Depending on patterns and density, they form different substances with different properties.
Phaenomena / Differences between alike substances:
Generally speaking this depends on the purity of the element. Soil for example would have a high concentration of earth strings with minor impurities of the other elements. Sand on the other hand would have more impurities.
Also, the arrangement - or weave patters - are important.
F W F W F W F W
F W F W F W F W
has different properties than
F W F W F W F W
W F W F W F W F
though it consists of the exact same strings.
I think we have to abandon our present world view. The air element in my fantasy setting is not to be confused with the air on our planet (N, O, CO_2,...).
Aggregation states could be borrowed. This allows water and other elements/substances to vaporize or freeze. Only substances with firestrings in it can burn. The higher the concentration, the more intense the fire and the easier it is to ignite (firing point at lower temperatures).
Life Strings I'd simply postulate that it is possible :P Same goes for the manipulating organs. By carefully positoning resonaters, found in these organs, it is possible to create an elementary-field (as a result of interference of the single resonators) of almost any complexity , which affects the strings in the surrounding substances.
My question exactly is: Are there any flaws, where this falls out of place, or is this somehow plausible?