Does anyone know how fog works?

Yesterday I was working in my Hiroshima image and I thought "It would be
possible using ground fog, to make an spherical fog writing

up x*y*z

or something similar?"
Well, the idea is that it happens something I dont understand but it doesnt
sets any error. So probably something can be done.

And why I want to do something like this? because in some cases it can look
like the interior propertie but renders much more faster. Does anyone know
something about this?

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