Okay, so I was thinking about the origin of (spoken) language, and I couldn't find any possible reason as to why all of a sudden, thousands of years ago, people thought up words. Yes, it seems simple. But if you think about it, where did they get they inspiration to say that, for example, this painful burning thing is "fire" (in their language, of course)? The only reasonable idea I came up with was that they used words of onomatopoeic origin, like "hwooooooo" for "wind blowing through a cave" and "slosh" for "water" and "KABLAM" for "thunder". There's one obvious problem with this idea, though: you can't get all that far lexicon wise if you go only by onomatopoeia. There's a lot of things that make no audible sound, even if moved. Like soil. Or the land. Or a mountain. And much more things that I care not to list.
Anyway, if you know anything else about this topic or have an opinion (and/or references to works on this topic), I'd be glad to hear it. I'm really curious to see what people think. Note that all of the above thoughts are self-provoked: while I'm waiting for a reply, I'll do some more research and try to find my answers.
I put this in the Conlangery because I'm going to use the information I gather here to create a proto-language to evolve it through at least five distinct stages. I guess it could be moved somewhere else, but I do believe that this topic could be interesting to other conlangers aiming to create a proto-language.
Fluent: English, русский язык
Proficient: français, 日本語
Beginning: suomi, davvisámegiella, 中文 (普通話), norsk, cymraeg