Larry Dighera wrote:

LOL. Well, what's your definition of a cloud?

Hve you ever tried to define what a dog is, in a purely abstract, yet
unequivocal way, and how it can be disdinguished at first sight from,
say, a cat or a hamster? With a definition that holds for all kinds,
forms and sizes of dogs? Yet if you see one, you recognize it.

Stefan