Thanks Bobad. Actually, I thought you were talking about alcoholic beverages, so your link was surprising. But I have to say that it left me in the dark.

So I had to turn to my friend google and I think I see the light now.

Who woulda known there are bubble levels for cameras??
Obviously not me, but I'm hip to it now. Well, maybe "hip" is too strong a word, but at least I think I know that there are bubbles in cameras and those are called spirit levels and the photographers have to watch that they don't fart so they don't drink any carbonated drinks while they're working.

Do I have it right?