I think, Bitcoin is similar to WATER.
In the Nature, there is water in the clouds, not gold

Any opinions?

That's wrong. Water can be seen everywhere, so there is no similarities between water and Bitcoin. Moreover, basically you are contradicting yourself. If you are talking about nature then natural cloud will have water and the electronic format cloud will have anything hence why not bitcoins?
You can even find water these days more than you can see Gold; there are streams, lake, rivers and there rest of them and it's even in your house when you switch on the tap. I think cryptocurrency (Bitcoin) is very unique, and what it requires is trust. It's something we don't see, it's simply mathematics and numbers that you only see on your screen using your computer or smartphone. We just have to trust in Bitcoin and it will keep growing, if not, it wouldn't.