The area around what is now Pyrmont Point Park used to hold working wharves, dating back to the previous century and indeed the one before that. Here we see a group of pylons which once supported a wharf near the former NSW Water Police headquarters. While their reflections in the water still show massive and sturdy blocks of wood, it's all an illusion; near the waterline it's obvious that their bases are gradually being eaten away by various forms of marine life and, presumably, by plain old rot. In due course they'll doubtless need to be removed or will collapse under their own weight.
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Edit September 2023: At the time that I wrote the above commentary the Pyrmont Point Park name was the more common one on maps and documents so it's the one that I've used. I've updated it in the location line.

Are the posts still there? By the mid 2010s, despite starting a photo a day project which saw me frequently visit Pirrama Park, I had largely forgotten about these shots from 2009 and am only rediscovering them now as part of my "Get Off PBase" project. I therefore didn't follow up on a lot of the shots. Google Street View seems to have made only one pass along the adjacent wharves (which, after all, are not a street so we're lucky to even have that), that being in 2019. There is no longer a forest of posts like this in the area where I would have shot this, but there are still a few examples in the water.