Angaston is a township in South Australia (just northwest of Adelaide) which did indeed have a marble quarry (and may still do as far as I know). I'm guessing that this marble piece hailed from there.

The comment by sculptor May Barrie is "The work speaks for itself".

Oooh-kay. But I may be a tad hard of hearing today.

Or alternatively, it's meant to be whatever your inner voice tells you it is.
Addendum: My personal opinion is that Facebook is a sociopathic organisation that steals other peoples' intellectual property (including the images in this gallery) despite being explicitly denied permission to do so.