@themick:
They drive nature but they arent nature. You said think about the environment and the earth. Well light doesnt come from the earth they arent a part of the earth. They are from without the ecosystem.
There are plenty of other environments in the universe where light is not a part of it even on earth there are deep sea animals that will never see the sun. But you are pulling in light as if you are talking about on a universal scale. Well if you are gonna talk about a scale that large then everything would be on it.
Light is still apart of the environment. Only counting forces generated by the earth is a very narrow view of nature.
How is any of this other stuff contradict light being a part of nature? What drives some deep sea environments? Smoke. Pattern still fits.
The only thing left to mention is gravity/dark matter which in Oda's world is an element. Planets, stars, and other cosmic bodies are in the a fantasy sense earth and fire; comets ice.
If we are going with this idea then rubber, poision, diamonds, and vibrations should be logia. They belong to the natural physical world and arent created by man.
Why are you reaching so far? Belonging to the physical world and not being created by man aren't even the definitions of an element or force of nature. You're not even right about this anyways. Rubber and poison can be created by organic creatures including humans in fact the latter can only be created by organic creatures. Vibrations can't be a logia because its not even a thing but a motion, an oscillation, a movement. Its like saying there could be an inertia or repulsing logia. Diamond is debatable because it is just Carbon in a solid form like Ice is to water.
Elements are the foundations of the physical world. Looking out your window its clear the world is comprised of Light, Darkness, Earth, Wind, Water, and Fire. Electricity, Metal, Smoke, and different forms or combinations of these elements such as sand, ice, mud, and lava can also be added to the list from a classical point of view. Rubber and Poison do not fit just like wax, straw, and bubbles. If we get wood or plants they will be paramecia too. There is no way you cannot see the difference.