What's your first impression of Eureka?

[Fyce]

The problem is that the analogy is poorly made. The "glass is half empty" analogy would've worked better for your argument as it is truly about perception.

Any analogy can be debunked if you try hard enough. And that's exactly why it's ridiculous to do it. As long as it gets the point across, it has served its purpose.

For example, I could argue that the analogy of the half empty glass doesn't work either because the glass is never "empty", air molecules fill the upper part, so the glass is never technically empty... And I would bet you that if I used that analogy, someone would've came to me saying exactly that.

So, again, analogies aren't meant to be over-analyzed to be debunked. They just try to convey a simple idea. That's their sole and only purpose. As long as this idea is relevant to the point, it's good enough.