This is what I call the superficial barrier. Metaphors and analogies introduce significance because they take a wider focus. They abstract the essence of the idea, which is possible because ideas have common roots. Every trivial idea is an example of something more profound. Even if something is totally dumb, its flawed reasoning can shine light on large parts of sociology and psychology.
Language evolves through slang.
Sense language is a symbolic association rather than an association between two actual things, any sound or symbol can stand for anything. Like fashion, its form is arbitrary and changes by following those who refuse to follow it. The degree of similarity of the languages used on Polaneasion islands corresponds to their physical distance apart because the language has traveled on canoe. Seeing something worthy that does not have a word is a cool thing. For my friends, the meaning of the word is partly defined in me.