quick observation..
The layout of the columns is a "constellation" that looks like the little dipper... same basic layout, number of stars, curve of handle
If so, the H column is the odd one out, and if you look for an interesting star around there, I find a syzygy of k Cephius & HIP 99169, tho distance away isn't quite right. Or maybe HIP 92738
Also note that stars come up in the symbology for F column, which is speculated to encode spectra, maybe from stars
Not sure if this is relevant or not, but it might be worth adding that the little dipper is not visible from the southern hemisphere.
Given that the sculpture is in Australia, that seems like a plausible clue to me.
Yeah, it's a good point. The end of the handle for the Little Dipper is Polaris, the North Star
I have it lined up now in Celestia, to see how it would project relative to someone looking down on the columns in Canberra from above, and seeing the LD thru the Earth. The whole constellation is flipped left-right, and would always be a bit under the horizon looking North, and skewed if projected on the ground plane.
Also filtered down to only visible stars.. looks more like HIP 90182
https://www.universeguide.com/star/90182/hip90182
Another thing, pillar 4 (pillar instead of column on dcrypt.org) uses a constellation encoding
My introduction to most of these ciphers has been through DEF CON puzzles over the last 20 years. This is a fun way of seeing them presented to the world.
I'm reminded of https://en.wikipedia.org/wiki/Kryptos
see also https://www.dkrypt.org/
"you are so ugly, you could be a modern art installation"