Quote:Perhaps, but what is a rock? Is it not as subjective as it is matter-of-fact?
If you can adequatey answer the question, I'll consider your label.
No, a rock is not subjective. It is a naturally occurring aggregate of minerals (ask any geologist). Thus, if something is NOT a naturally occurring aggregate of minerals, it cannot be a rock. Further thus, the categories of 'rock' and 'not a rock' are a universal set - there are no other labels possible.
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax